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Finding the Fourth Proportional to 286,638.40, 429,961.20 and 86,960.80

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Solution

The fourth proportional to 286,638.40, 429,961.20 and 86,960.80 is: 130,442.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    286,638.40 : 429,961.20 = 86,960.80 : x
  2. Step 2: Convert to fraction form
    286,638.40/429,961.20 = 86,960.80/x
  3. Step 3: Cross multiply
    286,638.40x = 429,961.20 × 86,960.80
  4. Step 4: Simplify right side
    286,638.40x = 37,389,769,920.96
  5. Step 5: Solve for x
    x = 37,389,769,920.96/286,638.40
  6. Step 6: Final answer
    x = 130,442.29

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