Finding the Fourth Proportional to 139,285, 192,215.56 and 78,854.08

Step by Step Solution

1. Step 1: Write the proportion equation
   139,285 : 192,215.56 = 78,854.08 : x
2. Step 2: Convert to fraction form
   139,285/192,215.56 = 78,854.08/x
3. Step 3: Cross multiply
   139,285x = 192,215.56 × 78,854.08
4. Step 4: Simplify right side
   139,285x = 15,156,981,145.48
5. Step 5: Solve for x
   x = 15,156,981,145.48/139,285
6. Step 6: Final answer
   x = 108,819.91