Finding the Fourth Proportional to 2,513.85, 3,772.51 and 1,128.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,513.85 : 3,772.51 = 1,128.74 : x
2. Step 2: Convert to fraction form
   2,513.85/3,772.51 = 1,128.74/x
3. Step 3: Cross multiply
   2,513.85x = 3,772.51 × 1,128.74
4. Step 4: Simplify right side
   2,513.85x = 4,258,182.94
5. Step 5: Solve for x
   x = 4,258,182.94/2,513.85
6. Step 6: Final answer
   x = 1,693.89