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Finding the Fourth Proportional to 391,631.80, 587,447.70 and 258,662.20

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Solution

The fourth proportional to 391,631.80, 587,447.70 and 258,662.20 is: 387,993.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,631.80 : 587,447.70 = 258,662.20 : x
  2. Step 2: Convert to fraction form
    391,631.80/587,447.70 = 258,662.20/x
  3. Step 3: Cross multiply
    391,631.80x = 587,447.70 × 258,662.20
  4. Step 4: Simplify right side
    391,631.80x = 151,950,514,466.94
  5. Step 5: Solve for x
    x = 151,950,514,466.94/391,631.80
  6. Step 6: Final answer
    x = 387,993.30

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