Finding the Fourth Proportional to 12,691.12, 17,522.32 and 7,912.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,691.12 : 17,522.32 = 7,912.96 : x
2. Step 2: Convert to fraction form
   12,691.12/17,522.32 = 7,912.96/x
3. Step 3: Cross multiply
   12,691.12x = 17,522.32 × 7,912.96
4. Step 4: Simplify right side
   12,691.12x = 138,653,417.27
5. Step 5: Solve for x
   x = 138,653,417.27/12,691.12
6. Step 6: Final answer
   x = 10,925.23