Finding the Fourth Proportional to 1,659.21, 2,488.83 and 1,328.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.21 : 2,488.83 = 1,328.61 : x
2. Step 2: Convert to fraction form
   1,659.21/2,488.83 = 1,328.61/x
3. Step 3: Cross multiply
   1,659.21x = 2,488.83 × 1,328.61
4. Step 4: Simplify right side
   1,659.21x = 3,306,665.34
5. Step 5: Solve for x
   x = 3,306,665.34/1,659.21
6. Step 6: Final answer
   x = 1,992.92