Finding the Fourth Proportional to 2,152.91, 3,229.91 and 613.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,152.91 : 3,229.91 = 613.91 : x
2. Step 2: Convert to fraction form
   2,152.91/3,229.91 = 613.91/x
3. Step 3: Cross multiply
   2,152.91x = 3,229.91 × 613.91
4. Step 4: Simplify right side
   2,152.91x = 1,982,854.83
5. Step 5: Solve for x
   x = 1,982,854.83/2,152.91
6. Step 6: Final answer
   x = 921.01