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Finding the Fourth Proportional to 21,855.20, 32,787.62 and 12,978.60

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Solution

The fourth proportional to 21,855.20, 32,787.62 and 12,978.60 is: 19,470.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,855.20 : 32,787.62 = 12,978.60 : x
  2. Step 2: Convert to fraction form
    21,855.20/32,787.62 = 12,978.60/x
  3. Step 3: Cross multiply
    21,855.20x = 32,787.62 × 12,978.60
  4. Step 4: Simplify right side
    21,855.20x = 425,537,404.93
  5. Step 5: Solve for x
    x = 425,537,404.93/21,855.20
  6. Step 6: Final answer
    x = 19,470.76

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