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Finding the Fourth Proportional to 403,407.20, 605,110.80 and 261,689.60

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Solution

The fourth proportional to 403,407.20, 605,110.80 and 261,689.60 is: 392,534.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,407.20 : 605,110.80 = 261,689.60 : x
  2. Step 2: Convert to fraction form
    403,407.20/605,110.80 = 261,689.60/x
  3. Step 3: Cross multiply
    403,407.20x = 605,110.80 × 261,689.60
  4. Step 4: Simplify right side
    403,407.20x = 158,351,203,207.68
  5. Step 5: Solve for x
    x = 158,351,203,207.68/403,407.20
  6. Step 6: Final answer
    x = 392,534.40

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