Finding the Fourth Proportional to 142,089.92, 196,090.62 and 81,680.12

Step by Step Solution

1. Step 1: Write the proportion equation
   142,089.92 : 196,090.62 = 81,680.12 : x
2. Step 2: Convert to fraction form
   142,089.92/196,090.62 = 81,680.12/x
3. Step 3: Cross multiply
   142,089.92x = 196,090.62 × 81,680.12
4. Step 4: Simplify right side
   142,089.92x = 16,016,705,372.47
5. Step 5: Solve for x
   x = 16,016,705,372.47/142,089.92
6. Step 6: Final answer
   x = 112,722.32