Finding the Fourth Proportional to 142,146.74, 196,162.46 and 81,729.20

Step by Step Solution

1. Step 1: Write the proportion equation
   142,146.74 : 196,162.46 = 81,729.20 : x
2. Step 2: Convert to fraction form
   142,146.74/196,162.46 = 81,729.20/x
3. Step 3: Cross multiply
   142,146.74x = 196,162.46 × 81,729.20
4. Step 4: Simplify right side
   142,146.74x = 16,032,200,925.83
5. Step 5: Solve for x
   x = 16,032,200,925.83/142,146.74
6. Step 6: Final answer
   x = 112,786.27