Finding the Fourth Proportional to 12,702.56, 17,538.10 and 7,929.77

Step by Step Solution

1. Step 1: Write the proportion equation
   12,702.56 : 17,538.10 = 7,929.77 : x
2. Step 2: Convert to fraction form
   12,702.56/17,538.10 = 7,929.77/x
3. Step 3: Cross multiply
   12,702.56x = 17,538.10 × 7,929.77
4. Step 4: Simplify right side
   12,702.56x = 139,073,099.24
5. Step 5: Solve for x
   x = 139,073,099.24/12,702.56
6. Step 6: Final answer
   x = 10,948.43