Finding the Fourth Proportional to 102,396.72, 141,325.56 and 81,336.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,396.72 : 141,325.56 = 81,336.72 : x
2. Step 2: Convert to fraction form
   102,396.72/141,325.56 = 81,336.72/x
3. Step 3: Cross multiply
   102,396.72x = 141,325.56 × 81,336.72
4. Step 4: Simplify right side
   102,396.72x = 11,494,957,502.56
5. Step 5: Solve for x
   x = 11,494,957,502.56/102,396.72
6. Step 6: Final answer
   x = 112,259.04