Finding the Fourth Proportional to 2,513.88, 3,772.12 and 1,128.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,513.88 : 3,772.12 = 1,128.16 : x
2. Step 2: Convert to fraction form
   2,513.88/3,772.12 = 1,128.16/x
3. Step 3: Cross multiply
   2,513.88x = 3,772.12 × 1,128.16
4. Step 4: Simplify right side
   2,513.88x = 4,255,554.90
5. Step 5: Solve for x
   x = 4,255,554.90/2,513.88
6. Step 6: Final answer
   x = 1,692.82