Finding the Fourth Proportional to 1,802.72, 2,488.14 and 1,139.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,802.72 : 2,488.14 = 1,139.15 : x
2. Step 2: Convert to fraction form
   1,802.72/2,488.14 = 1,139.15/x
3. Step 3: Cross multiply
   1,802.72x = 2,488.14 × 1,139.15
4. Step 4: Simplify right side
   1,802.72x = 2,834,364.68
5. Step 5: Solve for x
   x = 2,834,364.68/1,802.72
6. Step 6: Final answer
   x = 1,572.27