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Finding the Fourth Proportional to 657,911.40, 987,327.90 and 421,828.20

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Solution

The fourth proportional to 657,911.40, 987,327.90 and 421,828.20 is: 633,037.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,911.40 : 987,327.90 = 421,828.20 : x
  2. Step 2: Convert to fraction form
    657,911.40/987,327.90 = 421,828.20/x
  3. Step 3: Cross multiply
    657,911.40x = 987,327.90 × 421,828.20
  4. Step 4: Simplify right side
    657,911.40x = 416,482,750,866.78
  5. Step 5: Solve for x
    x = 416,482,750,866.78/657,911.40
  6. Step 6: Final answer
    x = 633,037.75

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