Finding the Fourth Proportional to 142,311.08, 196,457.88 and 91,399.78

Step by Step Solution

1. Step 1: Write the proportion equation
   142,311.08 : 196,457.88 = 91,399.78 : x
2. Step 2: Convert to fraction form
   142,311.08/196,457.88 = 91,399.78/x
3. Step 3: Cross multiply
   142,311.08x = 196,457.88 × 91,399.78
4. Step 4: Simplify right side
   142,311.08x = 17,956,207,011.27
5. Step 5: Solve for x
   x = 17,956,207,011.27/142,311.08
6. Step 6: Final answer
   x = 126,175.75