Finding the Fourth Proportional to 1,140.57, 1,573.98 and 616.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,140.57 : 1,573.98 = 616.59 : x
2. Step 2: Convert to fraction form
   1,140.57/1,573.98 = 616.59/x
3. Step 3: Cross multiply
   1,140.57x = 1,573.98 × 616.59
4. Step 4: Simplify right side
   1,140.57x = 970,500.33
5. Step 5: Solve for x
   x = 970,500.33/1,140.57
6. Step 6: Final answer
   x = 850.89