Finding the Fourth Proportional to 1,669.86, 2,304.18 and 961.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,669.86 : 2,304.18 = 961.61 : x
2. Step 2: Convert to fraction form
   1,669.86/2,304.18 = 961.61/x
3. Step 3: Cross multiply
   1,669.86x = 2,304.18 × 961.61
4. Step 4: Simplify right side
   1,669.86x = 2,215,711.01
5. Step 5: Solve for x
   x = 2,215,711.01/1,669.86
6. Step 6: Final answer
   x = 1,326.88