Finding the Fourth Proportional to 12,612.71, 17,405.27 and 7,899.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,612.71 : 17,405.27 = 7,899.59 : x
2. Step 2: Convert to fraction form
   12,612.71/17,405.27 = 7,899.59/x
3. Step 3: Cross multiply
   12,612.71x = 17,405.27 × 7,899.59
4. Step 4: Simplify right side
   12,612.71x = 137,494,370.32
5. Step 5: Solve for x
   x = 137,494,370.32/12,612.71
6. Step 6: Final answer
   x = 10,901.26