Finding the Fourth Proportional to 142,139.17, 196,145.04 and 81,667

Step by Step Solution

1. Step 1: Write the proportion equation
   142,139.17 : 196,145.04 = 81,667 : x
2. Step 2: Convert to fraction form
   142,139.17/196,145.04 = 81,667/x
3. Step 3: Cross multiply
   142,139.17x = 196,145.04 × 81,667
4. Step 4: Simplify right side
   142,139.17x = 16,018,576,981.68
5. Step 5: Solve for x
   x = 16,018,576,981.68/142,139.17
6. Step 6: Final answer
   x = 112,696.43