Finding the Fourth Proportional to 1,805.88, 2,490.63 and 1,276.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,805.88 : 2,490.63 = 1,276.55 : x
2. Step 2: Convert to fraction form
   1,805.88/2,490.63 = 1,276.55/x
3. Step 3: Cross multiply
   1,805.88x = 2,490.63 × 1,276.55
4. Step 4: Simplify right side
   1,805.88x = 3,179,401.27
5. Step 5: Solve for x
   x = 3,179,401.27/1,805.88
6. Step 6: Final answer
   x = 1,760.58