Finding the Fourth Proportional to 1,521.09, 2,280.38 and 1,325.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.09 : 2,280.38 = 1,325.61 : x
2. Step 2: Convert to fraction form
   1,521.09/2,280.38 = 1,325.61/x
3. Step 3: Cross multiply
   1,521.09x = 2,280.38 × 1,325.61
4. Step 4: Simplify right side
   1,521.09x = 3,022,887.90
5. Step 5: Solve for x
   x = 3,022,887.90/1,521.09
6. Step 6: Final answer
   x = 1,987.32