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Finding the Fourth Proportional to 8,660.10, 12,987.36 and 2,815.32

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Solution

The fourth proportional to 8,660.10, 12,987.36 and 2,815.32 is: 4,222.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,660.10 : 12,987.36 = 2,815.32 : x
  2. Step 2: Convert to fraction form
    8,660.10/12,987.36 = 2,815.32/x
  3. Step 3: Cross multiply
    8,660.10x = 12,987.36 × 2,815.32
  4. Step 4: Simplify right side
    8,660.10x = 36,563,574.36
  5. Step 5: Solve for x
    x = 36,563,574.36/8,660.10
  6. Step 6: Final answer
    x = 4,222.07

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