Finding the Fourth Proportional to 139,411.30, 192,402.96 and 78,163.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,411.30 : 192,402.96 = 78,163.30 : x
2. Step 2: Convert to fraction form
   139,411.30/192,402.96 = 78,163.30/x
3. Step 3: Cross multiply
   139,411.30x = 192,402.96 × 78,163.30
4. Step 4: Simplify right side
   139,411.30x = 15,038,850,283.37
5. Step 5: Solve for x
   x = 15,038,850,283.37/139,411.30
6. Step 6: Final answer
   x = 107,873.97