Finding the Fourth Proportional to 1,802.90, 2,488.24 and 1,057.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,802.90 : 2,488.24 = 1,057.15 : x
2. Step 2: Convert to fraction form
   1,802.90/2,488.24 = 1,057.15/x
3. Step 3: Cross multiply
   1,802.90x = 2,488.24 × 1,057.15
4. Step 4: Simplify right side
   1,802.90x = 2,630,442.92
5. Step 5: Solve for x
   x = 2,630,442.92/1,802.90
6. Step 6: Final answer
   x = 1,459.01