Finding the Fourth Proportional to 142,049.39, 196,021.50 and 81,577.40

Step by Step Solution

1. Step 1: Write the proportion equation
   142,049.39 : 196,021.50 = 81,577.40 : x
2. Step 2: Convert to fraction form
   142,049.39/196,021.50 = 81,577.40/x
3. Step 3: Cross multiply
   142,049.39x = 196,021.50 × 81,577.40
4. Step 4: Simplify right side
   142,049.39x = 15,990,924,314.10
5. Step 5: Solve for x
   x = 15,990,924,314.10/142,049.39
6. Step 6: Final answer
   x = 112,572.99