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Finding the Fourth Proportional to 128,530.20, 192,795.30 and 86,539.80

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Solution

The fourth proportional to 128,530.20, 192,795.30 and 86,539.80 is: 129,809.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,530.20 : 192,795.30 = 86,539.80 : x
  2. Step 2: Convert to fraction form
    128,530.20/192,795.30 = 86,539.80/x
  3. Step 3: Cross multiply
    128,530.20x = 192,795.30 × 86,539.80
  4. Step 4: Simplify right side
    128,530.20x = 16,684,466,702.94
  5. Step 5: Solve for x
    x = 16,684,466,702.94/128,530.20
  6. Step 6: Final answer
    x = 129,809.70

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