Finding the Fourth Proportional to 3,085.57, 4,628.76 and 1,139.14

Step by Step Solution

1. Step 1: Write the proportion equation
   3,085.57 : 4,628.76 = 1,139.14 : x
2. Step 2: Convert to fraction form
   3,085.57/4,628.76 = 1,139.14/x
3. Step 3: Cross multiply
   3,085.57x = 4,628.76 × 1,139.14
4. Step 4: Simplify right side
   3,085.57x = 5,272,805.67
5. Step 5: Solve for x
   x = 5,272,805.67/3,085.57
6. Step 6: Final answer
   x = 1,708.86