Finding the Fourth Proportional to 2,979.18, 4,461.12 and 2,891.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,979.18 : 4,461.12 = 2,891.61 : x
2. Step 2: Convert to fraction form
   2,979.18/4,461.12 = 2,891.61/x
3. Step 3: Cross multiply
   2,979.18x = 4,461.12 × 2,891.61
4. Step 4: Simplify right side
   2,979.18x = 12,899,819.20
5. Step 5: Solve for x
   x = 12,899,819.20/2,979.18
6. Step 6: Final answer
   x = 4,329.99