Finding the Fourth Proportional to 2,288.99, 3,158.98 and 1,280.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.99 : 3,158.98 = 1,280.80 : x
2. Step 2: Convert to fraction form
   2,288.99/3,158.98 = 1,280.80/x
3. Step 3: Cross multiply
   2,288.99x = 3,158.98 × 1,280.80
4. Step 4: Simplify right side
   2,288.99x = 4,046,011.77
5. Step 5: Solve for x
   x = 4,046,011.77/2,288.99
6. Step 6: Final answer
   x = 1,767.60