Finding the Fourth Proportional to 142,786.30, 213,718.65 and 131,727.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142,786.30 : 213,718.65 = 131,727.10 : x
2. Step 2: Convert to fraction form
   142,786.30/213,718.65 = 131,727.10/x
3. Step 3: Cross multiply
   142,786.30x = 213,718.65 × 131,727.10
4. Step 4: Simplify right side
   142,786.30x = 28,152,537,980.42
5. Step 5: Solve for x
   x = 28,152,537,980.42/142,786.30
6. Step 6: Final answer
   x = 197,165.54