Finding the Fourth Proportional to 139,361.78, 192,399.06 and 91,753.54

Step by Step Solution

1. Step 1: Write the proportion equation
   139,361.78 : 192,399.06 = 91,753.54 : x
2. Step 2: Convert to fraction form
   139,361.78/192,399.06 = 91,753.54/x
3. Step 3: Cross multiply
   139,361.78x = 192,399.06 × 91,753.54
4. Step 4: Simplify right side
   139,361.78x = 17,653,294,847.67
5. Step 5: Solve for x
   x = 17,653,294,847.67/139,361.78
6. Step 6: Final answer
   x = 126,672.43