Finding the Fourth Proportional to 2,427.80, 3,640.50 and 1,128.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,427.80 : 3,640.50 = 1,128.44 : x
2. Step 2: Convert to fraction form
   2,427.80/3,640.50 = 1,128.44/x
3. Step 3: Cross multiply
   2,427.80x = 3,640.50 × 1,128.44
4. Step 4: Simplify right side
   2,427.80x = 4,108,085.82
5. Step 5: Solve for x
   x = 4,108,085.82/2,427.80
6. Step 6: Final answer
   x = 1,692.10