Finding the Fourth Proportional to 142,240.48, 196,297.50 and 81,811.05

Step by Step Solution

1. Step 1: Write the proportion equation
   142,240.48 : 196,297.50 = 81,811.05 : x
2. Step 2: Convert to fraction form
   142,240.48/196,297.50 = 81,811.05/x
3. Step 3: Cross multiply
   142,240.48x = 196,297.50 × 81,811.05
4. Step 4: Simplify right side
   142,240.48x = 16,059,304,587.38
5. Step 5: Solve for x
   x = 16,059,304,587.38/142,240.48
6. Step 6: Final answer
   x = 112,902.49