Finding the Fourth Proportional to 12,625.76, 17,428.96 and 7,909.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,625.76 : 17,428.96 = 7,909.04 : x
2. Step 2: Convert to fraction form
   12,625.76/17,428.96 = 7,909.04/x
3. Step 3: Cross multiply
   12,625.76x = 17,428.96 × 7,909.04
4. Step 4: Simplify right side
   12,625.76x = 137,846,341.80
5. Step 5: Solve for x
   x = 137,846,341.80/12,625.76
6. Step 6: Final answer
   x = 10,917.86