Finding the Fourth Proportional to 142,108.72, 196,099.40 and 81,679.52

Step by Step Solution

1. Step 1: Write the proportion equation
   142,108.72 : 196,099.40 = 81,679.52 : x
2. Step 2: Convert to fraction form
   142,108.72/196,099.40 = 81,679.52/x
3. Step 3: Cross multiply
   142,108.72x = 196,099.40 × 81,679.52
4. Step 4: Simplify right side
   142,108.72x = 16,017,304,864.29
5. Step 5: Solve for x
   x = 16,017,304,864.29/142,108.72
6. Step 6: Final answer
   x = 112,711.63