Finding the Fourth Proportional to 139,255.32, 192,118.52 and 78,812.11

Step by Step Solution

1. Step 1: Write the proportion equation
   139,255.32 : 192,118.52 = 78,812.11 : x
2. Step 2: Convert to fraction form
   139,255.32/192,118.52 = 78,812.11/x
3. Step 3: Cross multiply
   139,255.32x = 192,118.52 × 78,812.11
4. Step 4: Simplify right side
   139,255.32x = 15,141,264,576.62
5. Step 5: Solve for x
   x = 15,141,264,576.62/139,255.32
6. Step 6: Final answer
   x = 108,730.24