Finding the Fourth Proportional to 139,125.78, 192,003.12 and 78,696.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,125.78 : 192,003.12 = 78,696.48 : x
2. Step 2: Convert to fraction form
   139,125.78/192,003.12 = 78,696.48/x
3. Step 3: Cross multiply
   139,125.78x = 192,003.12 × 78,696.48
4. Step 4: Simplify right side
   139,125.78x = 15,109,969,693.02
5. Step 5: Solve for x
   x = 15,109,969,693.02/139,125.78
6. Step 6: Final answer
   x = 108,606.54