Finding the Fourth Proportional to 2,665.98, 4,001.76 and 1,280.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.98 : 4,001.76 = 1,280.50 : x
2. Step 2: Convert to fraction form
   2,665.98/4,001.76 = 1,280.50/x
3. Step 3: Cross multiply
   2,665.98x = 4,001.76 × 1,280.50
4. Step 4: Simplify right side
   2,665.98x = 5,124,253.68
5. Step 5: Solve for x
   x = 5,124,253.68/2,665.98
6. Step 6: Final answer
   x = 1,922.09