Finding the Fourth Proportional to 108,710.72, 149,951.76 and 78,540.38

Step by Step Solution

1. Step 1: Write the proportion equation
   108,710.72 : 149,951.76 = 78,540.38 : x
2. Step 2: Convert to fraction form
   108,710.72/149,951.76 = 78,540.38/x
3. Step 3: Cross multiply
   108,710.72x = 149,951.76 × 78,540.38
4. Step 4: Simplify right side
   108,710.72x = 11,777,268,212.07
5. Step 5: Solve for x
   x = 11,777,268,212.07/108,710.72
6. Step 6: Final answer
   x = 108,335.85