Finding the Fourth Proportional to 142,767.30, 213,690.15 and 131,708.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142,767.30 : 213,690.15 = 131,708.10 : x
2. Step 2: Convert to fraction form
   142,767.30/213,690.15 = 131,708.10/x
3. Step 3: Cross multiply
   142,767.30x = 213,690.15 × 131,708.10
4. Step 4: Simplify right side
   142,767.30x = 28,144,723,645.22
5. Step 5: Solve for x
   x = 28,144,723,645.22/142,767.30
6. Step 6: Final answer
   x = 197,137.05