Finding the Fourth Proportional to 139,155.59, 192,034.80 and 78,725.00

Step by Step Solution

1. Step 1: Write the proportion equation
   139,155.59 : 192,034.80 = 78,725.00 : x
2. Step 2: Convert to fraction form
   139,155.59/192,034.80 = 78,725.00/x
3. Step 3: Cross multiply
   139,155.59x = 192,034.80 × 78,725.00
4. Step 4: Simplify right side
   139,155.59x = 15,117,940,110.09
5. Step 5: Solve for x
   x = 15,117,940,110.09/139,155.59
6. Step 6: Final answer
   x = 108,640.55