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Finding the Fourth Proportional to 643,998.80, 965,998.20 and 407,608.40

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Solution

The fourth proportional to 643,998.80, 965,998.20 and 407,608.40 is: 611,412.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,998.80 : 965,998.20 = 407,608.40 : x
  2. Step 2: Convert to fraction form
    643,998.80/965,998.20 = 407,608.40/x
  3. Step 3: Cross multiply
    643,998.80x = 965,998.20 × 407,608.40
  4. Step 4: Simplify right side
    643,998.80x = 393,748,980,704.88
  5. Step 5: Solve for x
    x = 393,748,980,704.88/643,998.80
  6. Step 6: Final answer
    x = 611,412.60

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