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Finding the Fourth Proportional to 667,646.28, 921,206.34 and 395,578.20

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Solution

The fourth proportional to 667,646.28, 921,206.34 and 395,578.20 is: 545,811.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,646.28 : 921,206.34 = 395,578.20 : x
  2. Step 2: Convert to fraction form
    667,646.28/921,206.34 = 395,578.20/x
  3. Step 3: Cross multiply
    667,646.28x = 921,206.34 × 395,578.20
  4. Step 4: Simplify right side
    667,646.28x = 364,409,145,805.79
  5. Step 5: Solve for x
    x = 364,409,145,805.79/667,646.28
  6. Step 6: Final answer
    x = 545,811.69

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