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Finding the Fourth Proportional to 13,256.80, 19,880.40 and 6,680.80

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Solution

The fourth proportional to 13,256.80, 19,880.40 and 6,680.80 is: 10,018.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,256.80 : 19,880.40 = 6,680.80 : x
  2. Step 2: Convert to fraction form
    13,256.80/19,880.40 = 6,680.80/x
  3. Step 3: Cross multiply
    13,256.80x = 19,880.40 × 6,680.80
  4. Step 4: Simplify right side
    13,256.80x = 132,816,976.32
  5. Step 5: Solve for x
    x = 132,816,976.32/13,256.80
  6. Step 6: Final answer
    x = 10,018.78

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