Finding the Fourth Proportional to 139,393.37, 192,356.61 and 78,962.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,393.37 : 192,356.61 = 78,962.78 : x
2. Step 2: Convert to fraction form
   139,393.37/192,356.61 = 78,962.78/x
3. Step 3: Cross multiply
   139,393.37x = 192,356.61 × 78,962.78
4. Step 4: Simplify right side
   139,393.37x = 15,189,011,715.19
5. Step 5: Solve for x
   x = 15,189,011,715.19/139,393.37
6. Step 6: Final answer
   x = 108,965.10