Finding the Fourth Proportional to 3,086.31, 4,631.31 and 1,139.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,086.31 : 4,631.31 = 1,139.88 : x
2. Step 2: Convert to fraction form
   3,086.31/4,631.31 = 1,139.88/x
3. Step 3: Cross multiply
   3,086.31x = 4,631.31 × 1,139.88
4. Step 4: Simplify right side
   3,086.31x = 5,279,137.64
5. Step 5: Solve for x
   x = 5,279,137.64/3,086.31
6. Step 6: Final answer
   x = 1,710.50