Finding the Fourth Proportional to 57,719.10, 86,651.55 and 31,086.30

Step by Step Solution

1. Step 1: Write the proportion equation
   57,719.10 : 86,651.55 = 31,086.30 : x
2. Step 2: Convert to fraction form
   57,719.10/86,651.55 = 31,086.30/x
3. Step 3: Cross multiply
   57,719.10x = 86,651.55 × 31,086.30
4. Step 4: Simplify right side
   57,719.10x = 2,693,676,078.77
5. Step 5: Solve for x
   x = 2,693,676,078.77/57,719.10
6. Step 6: Final answer
   x = 46,668.71