Finding the Fourth Proportional to 2,488.10, 3,734.55 and 1,256.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,488.10 : 3,734.55 = 1,256.90 : x
2. Step 2: Convert to fraction form
   2,488.10/3,734.55 = 1,256.90/x
3. Step 3: Cross multiply
   2,488.10x = 3,734.55 × 1,256.90
4. Step 4: Simplify right side
   2,488.10x = 4,693,955.90
5. Step 5: Solve for x
   x = 4,693,955.90/2,488.10
6. Step 6: Final answer
   x = 1,886.56