Finding the Fourth Proportional to 99,339.71, 137,139.57 and 76,627.71

Step by Step Solution

1. Step 1: Write the proportion equation
   99,339.71 : 137,139.57 = 76,627.71 : x
2. Step 2: Convert to fraction form
   99,339.71/137,139.57 = 76,627.71/x
3. Step 3: Cross multiply
   99,339.71x = 137,139.57 × 76,627.71
4. Step 4: Simplify right side
   99,339.71x = 10,508,691,199.48
5. Step 5: Solve for x
   x = 10,508,691,199.48/99,339.71
6. Step 6: Final answer
   x = 105,785.41