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Finding the Fourth Proportional to 20,739.91, 28,623.86 and 13,186.99

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Solution

The fourth proportional to 20,739.91, 28,623.86 and 13,186.99 is: 18,199.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739.91 : 28,623.86 = 13,186.99 : x
  2. Step 2: Convert to fraction form
    20,739.91/28,623.86 = 13,186.99/x
  3. Step 3: Cross multiply
    20,739.91x = 28,623.86 × 13,186.99
  4. Step 4: Simplify right side
    20,739.91x = 377,462,467.54
  5. Step 5: Solve for x
    x = 377,462,467.54/20,739.91
  6. Step 6: Final answer
    x = 18,199.81

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