Finding the Fourth Proportional to 2,987.91, 4,123.17 and 1,661.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,987.91 : 4,123.17 = 1,661.61 : x
2. Step 2: Convert to fraction form
   2,987.91/4,123.17 = 1,661.61/x
3. Step 3: Cross multiply
   2,987.91x = 4,123.17 × 1,661.61
4. Step 4: Simplify right side
   2,987.91x = 6,851,100.50
5. Step 5: Solve for x
   x = 6,851,100.50/2,987.91
6. Step 6: Final answer
   x = 2,292.94