Finding the Fourth Proportional to 139,344.45, 192,288.89 and 78,915.53

Step by Step Solution

1. Step 1: Write the proportion equation
   139,344.45 : 192,288.89 = 78,915.53 : x
2. Step 2: Convert to fraction form
   139,344.45/192,288.89 = 78,915.53/x
3. Step 3: Cross multiply
   139,344.45x = 192,288.89 × 78,915.53
4. Step 4: Simplify right side
   139,344.45x = 15,174,578,903.31
5. Step 5: Solve for x
   x = 15,174,578,903.31/139,344.45
6. Step 6: Final answer
   x = 108,899.77