Finding the Fourth Proportional to 3,139.50, 4,710.78 and 1,291.17

Step by Step Solution

1. Step 1: Write the proportion equation
   3,139.50 : 4,710.78 = 1,291.17 : x
2. Step 2: Convert to fraction form
   3,139.50/4,710.78 = 1,291.17/x
3. Step 3: Cross multiply
   3,139.50x = 4,710.78 × 1,291.17
4. Step 4: Simplify right side
   3,139.50x = 6,082,434.43
5. Step 5: Solve for x
   x = 6,082,434.43/3,139.50
6. Step 6: Final answer
   x = 1,937.39