Finding the Fourth Proportional to 99,760.97, 137,672.10 and 78,276.46

Step by Step Solution

1. Step 1: Write the proportion equation
   99,760.97 : 137,672.10 = 78,276.46 : x
2. Step 2: Convert to fraction form
   99,760.97/137,672.10 = 78,276.46/x
3. Step 3: Cross multiply
   99,760.97x = 137,672.10 × 78,276.46
4. Step 4: Simplify right side
   99,760.97x = 10,776,484,284.59
5. Step 5: Solve for x
   x = 10,776,484,284.59/99,760.97
6. Step 6: Final answer
   x = 108,023.06