Finding the Fourth Proportional to 124,086.72, 171,148.02 and 78,725.64

Step by Step Solution

1. Step 1: Write the proportion equation
   124,086.72 : 171,148.02 = 78,725.64 : x
2. Step 2: Convert to fraction form
   124,086.72/171,148.02 = 78,725.64/x
3. Step 3: Cross multiply
   124,086.72x = 171,148.02 × 78,725.64
4. Step 4: Simplify right side
   124,086.72x = 13,473,737,409.23
5. Step 5: Solve for x
   x = 13,473,737,409.23/124,086.72
6. Step 6: Final answer
   x = 108,583.23