Finding the Fourth Proportional to 99,344.78, 137,146.56 and 76,632.78

Step by Step Solution

1. Step 1: Write the proportion equation
   99,344.78 : 137,146.56 = 76,632.78 : x
2. Step 2: Convert to fraction form
   99,344.78/137,146.56 = 76,632.78/x
3. Step 3: Cross multiply
   99,344.78x = 137,146.56 × 76,632.78
4. Step 4: Simplify right side
   99,344.78x = 10,509,922,160.24
5. Step 5: Solve for x
   x = 10,509,922,160.24/99,344.78
6. Step 6: Final answer
   x = 105,792.40