Finding the Fourth Proportional to 139,510.90, 192,516.42 and 78,253.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,510.90 : 192,516.42 = 78,253.72 : x
2. Step 2: Convert to fraction form
   139,510.90/192,516.42 = 78,253.72/x
3. Step 3: Cross multiply
   139,510.90x = 192,516.42 × 78,253.72
4. Step 4: Simplify right side
   139,510.90x = 15,065,126,026.08
5. Step 5: Solve for x
   x = 15,065,126,026.08/139,510.90
6. Step 6: Final answer
   x = 107,985.30