Finding the Fourth Proportional to 142,141.74, 196,155.57 and 81,724.20

Step by Step Solution

1. Step 1: Write the proportion equation
   142,141.74 : 196,155.57 = 81,724.20 : x
2. Step 2: Convert to fraction form
   142,141.74/196,155.57 = 81,724.20/x
3. Step 3: Cross multiply
   142,141.74x = 196,155.57 × 81,724.20
4. Step 4: Simplify right side
   142,141.74x = 16,030,657,033.79
5. Step 5: Solve for x
   x = 16,030,657,033.79/142,141.74
6. Step 6: Final answer
   x = 112,779.38