Finding the Fourth Proportional to 142,139.50, 196,152.46 and 81,721.96

Step by Step Solution

1. Step 1: Write the proportion equation
   142,139.50 : 196,152.46 = 81,721.96 : x
2. Step 2: Convert to fraction form
   142,139.50/196,152.46 = 81,721.96/x
3. Step 3: Cross multiply
   142,139.50x = 196,152.46 × 81,721.96
4. Step 4: Simplify right side
   142,139.50x = 16,029,962,795.34
5. Step 5: Solve for x
   x = 16,029,962,795.34/142,139.50
6. Step 6: Final answer
   x = 112,776.27