Finding the Fourth Proportional to 8,139.13, 12,207.89 and 5,523.44

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.13 : 12,207.89 = 5,523.44 : x
2. Step 2: Convert to fraction form
   8,139.13/12,207.89 = 5,523.44/x
3. Step 3: Cross multiply
   8,139.13x = 12,207.89 × 5,523.44
4. Step 4: Simplify right side
   8,139.13x = 67,429,500.71
5. Step 5: Solve for x
   x = 67,429,500.71/8,139.13
6. Step 6: Final answer
   x = 8,284.61