Finding the Fourth Proportional to 139,223.96, 192,128.98 and 78,793.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,223.96 : 192,128.98 = 78,793.50 : x
2. Step 2: Convert to fraction form
   139,223.96/192,128.98 = 78,793.50/x
3. Step 3: Cross multiply
   139,223.96x = 192,128.98 × 78,793.50
4. Step 4: Simplify right side
   139,223.96x = 15,138,514,785.63
5. Step 5: Solve for x
   x = 15,138,514,785.63/139,223.96
6. Step 6: Final answer
   x = 108,734.98