Finding the Fourth Proportional to 142,115.64, 196,111.92 and 88,399.12

Step by Step Solution

1. Step 1: Write the proportion equation
   142,115.64 : 196,111.92 = 88,399.12 : x
2. Step 2: Convert to fraction form
   142,115.64/196,111.92 = 88,399.12/x
3. Step 3: Cross multiply
   142,115.64x = 196,111.92 × 88,399.12
4. Step 4: Simplify right side
   142,115.64x = 17,336,121,149.51
5. Step 5: Solve for x
   x = 17,336,121,149.51/142,115.64
6. Step 6: Final answer
   x = 121,986.02