Finding the Fourth Proportional to 139,342.07, 192,292.10 and 78,912.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,342.07 : 192,292.10 = 78,912.72 : x
2. Step 2: Convert to fraction form
   139,342.07/192,292.10 = 78,912.72/x
3. Step 3: Cross multiply
   139,342.07x = 192,292.10 × 78,912.72
4. Step 4: Simplify right side
   139,342.07x = 15,174,292,250.95
5. Step 5: Solve for x
   x = 15,174,292,250.95/139,342.07
6. Step 6: Final answer
   x = 108,899.58