Finding the Fourth Proportional to 1,140.69, 1,574.15 and 616.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,140.69 : 1,574.15 = 616.72 : x
2. Step 2: Convert to fraction form
   1,140.69/1,574.15 = 616.72/x
3. Step 3: Cross multiply
   1,140.69x = 1,574.15 × 616.72
4. Step 4: Simplify right side
   1,140.69x = 970,809.79
5. Step 5: Solve for x
   x = 970,809.79/1,140.69
6. Step 6: Final answer
   x = 851.07