Finding the Fourth Proportional to 99,429.88, 137,242.20 and 79,426.12

Step by Step Solution

1. Step 1: Write the proportion equation
   99,429.88 : 137,242.20 = 79,426.12 : x
2. Step 2: Convert to fraction form
   99,429.88/137,242.20 = 79,426.12/x
3. Step 3: Cross multiply
   99,429.88x = 137,242.20 × 79,426.12
4. Step 4: Simplify right side
   99,429.88x = 10,900,615,446.26
5. Step 5: Solve for x
   x = 10,900,615,446.26/99,429.88
6. Step 6: Final answer
   x = 109,631.18