Finding the Fourth Proportional to 139,375.15, 192,353.06 and 78,127.20

Step by Step Solution

1. Step 1: Write the proportion equation
   139,375.15 : 192,353.06 = 78,127.20 : x
2. Step 2: Convert to fraction form
   139,375.15/192,353.06 = 78,127.20/x
3. Step 3: Cross multiply
   139,375.15x = 192,353.06 × 78,127.20
4. Step 4: Simplify right side
   139,375.15x = 15,028,006,184.55
5. Step 5: Solve for x
   x = 15,028,006,184.55/139,375.15
6. Step 6: Final answer
   x = 107,824.15