Finding the Fourth Proportional to 92,972.88, 139,380.72 and 40,342.80

Step by Step Solution

1. Step 1: Write the proportion equation
   92,972.88 : 139,380.72 = 40,342.80 : x
2. Step 2: Convert to fraction form
   92,972.88/139,380.72 = 40,342.80/x
3. Step 3: Cross multiply
   92,972.88x = 139,380.72 × 40,342.80
4. Step 4: Simplify right side
   92,972.88x = 5,623,008,510.82
5. Step 5: Solve for x
   x = 5,623,008,510.82/92,972.88
6. Step 6: Final answer
   x = 60,480.09