Finding the Fourth Proportional to 2,080, 2,870.40 and 1,148.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080 : 2,870.40 = 1,148.56 : x
2. Step 2: Convert to fraction form
   2,080/2,870.40 = 1,148.56/x
3. Step 3: Cross multiply
   2,080x = 2,870.40 × 1,148.56
4. Step 4: Simplify right side
   2,080x = 3,296,826.62
5. Step 5: Solve for x
   x = 3,296,826.62/2,080
6. Step 6: Final answer
   x = 1,585.01