Finding the Fourth Proportional to 1,805.76, 2,488.52 and 1,280.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,805.76 : 2,488.52 = 1,280.88 : x
2. Step 2: Convert to fraction form
   1,805.76/2,488.52 = 1,280.88/x
3. Step 3: Cross multiply
   1,805.76x = 2,488.52 × 1,280.88
4. Step 4: Simplify right side
   1,805.76x = 3,187,498.70
5. Step 5: Solve for x
   x = 3,187,498.70/1,805.76
6. Step 6: Final answer
   x = 1,765.18