Finding the Fourth Proportional to 142,158.24, 196,171.07 and 81,686.07

Step by Step Solution

1. Step 1: Write the proportion equation
   142,158.24 : 196,171.07 = 81,686.07 : x
2. Step 2: Convert to fraction form
   142,158.24/196,171.07 = 81,686.07/x
3. Step 3: Cross multiply
   142,158.24x = 196,171.07 × 81,686.07
4. Step 4: Simplify right side
   142,158.24x = 16,024,443,347.56
5. Step 5: Solve for x
   x = 16,024,443,347.56/142,158.24
6. Step 6: Final answer
   x = 112,722.58