Finding the Fourth Proportional to 142,423.38, 196,543.98 and 81,972

Step by Step Solution

1. Step 1: Write the proportion equation
   142,423.38 : 196,543.98 = 81,972 : x
2. Step 2: Convert to fraction form
   142,423.38/196,543.98 = 81,972/x
3. Step 3: Cross multiply
   142,423.38x = 196,543.98 × 81,972
4. Step 4: Simplify right side
   142,423.38x = 16,111,103,128.56
5. Step 5: Solve for x
   x = 16,111,103,128.56/142,423.38
6. Step 6: Final answer
   x = 113,121.20