Finding the Fourth Proportional to 142,707.40, 196,861.55 and 88,242.15

Step by Step Solution

1. Step 1: Write the proportion equation
   142,707.40 : 196,861.55 = 88,242.15 : x
2. Step 2: Convert to fraction form
   142,707.40/196,861.55 = 88,242.15/x
3. Step 3: Cross multiply
   142,707.40x = 196,861.55 × 88,242.15
4. Step 4: Simplify right side
   142,707.40x = 17,371,486,721.35
5. Step 5: Solve for x
   x = 17,371,486,721.35/142,707.40
6. Step 6: Final answer
   x = 121,728.00