Finding the Fourth Proportional to 139,506.72, 192,506.92 and 77,418.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,506.72 : 192,506.92 = 77,418.78 : x
2. Step 2: Convert to fraction form
   139,506.72/192,506.92 = 77,418.78/x
3. Step 3: Cross multiply
   139,506.72x = 192,506.92 × 77,418.78
4. Step 4: Simplify right side
   139,506.72x = 14,903,650,887.96
5. Step 5: Solve for x
   x = 14,903,650,887.96/139,506.72
6. Step 6: Final answer
   x = 106,831.06