Finding the Fourth Proportional to 2,426.90, 3,638.46 and 1,128.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,426.90 : 3,638.46 = 1,128.20 : x
2. Step 2: Convert to fraction form
   2,426.90/3,638.46 = 1,128.20/x
3. Step 3: Cross multiply
   2,426.90x = 3,638.46 × 1,128.20
4. Step 4: Simplify right side
   2,426.90x = 4,104,910.57
5. Step 5: Solve for x
   x = 4,104,910.57/2,426.90
6. Step 6: Final answer
   x = 1,691.42