Finding the Fourth Proportional to 1,874.15, 2,586.55 and 1,128.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,874.15 : 2,586.55 = 1,128.48 : x
2. Step 2: Convert to fraction form
   1,874.15/2,586.55 = 1,128.48/x
3. Step 3: Cross multiply
   1,874.15x = 2,586.55 × 1,128.48
4. Step 4: Simplify right side
   1,874.15x = 2,918,864.30
5. Step 5: Solve for x
   x = 2,918,864.30/1,874.15
6. Step 6: Final answer
   x = 1,557.43