Finding the Fourth Proportional to 142,140.17, 196,146.42 and 81,668

Step by Step Solution

1. Step 1: Write the proportion equation
   142,140.17 : 196,146.42 = 81,668 : x
2. Step 2: Convert to fraction form
   142,140.17/196,146.42 = 81,668/x
3. Step 3: Cross multiply
   142,140.17x = 196,146.42 × 81,668
4. Step 4: Simplify right side
   142,140.17x = 16,018,885,828.56
5. Step 5: Solve for x
   x = 16,018,885,828.56/142,140.17
6. Step 6: Final answer
   x = 112,697.81