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Finding the Fourth Proportional to 18,721.44, 28,080.30 and 4,870.44

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Solution

The fourth proportional to 18,721.44, 28,080.30 and 4,870.44 is: 7,305.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.44 : 28,080.30 = 4,870.44 : x
  2. Step 2: Convert to fraction form
    18,721.44/28,080.30 = 4,870.44/x
  3. Step 3: Cross multiply
    18,721.44x = 28,080.30 × 4,870.44
  4. Step 4: Simplify right side
    18,721.44x = 136,763,416.33
  5. Step 5: Solve for x
    x = 136,763,416.33/18,721.44
  6. Step 6: Final answer
    x = 7,305.18

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