Finding the Fourth Proportional to 99,142.74, 136,870.29 and 76,431.96

Step by Step Solution

1. Step 1: Write the proportion equation
   99,142.74 : 136,870.29 = 76,431.96 : x
2. Step 2: Convert to fraction form
   99,142.74/136,870.29 = 76,431.96/x
3. Step 3: Cross multiply
   99,142.74x = 136,870.29 × 76,431.96
4. Step 4: Simplify right side
   99,142.74x = 10,461,264,530.47
5. Step 5: Solve for x
   x = 10,461,264,530.47/99,142.74
6. Step 6: Final answer
   x = 105,517.20