Finding the Fourth Proportional to 5,123.92, 7,685.78 and 1,661.18

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.92 : 7,685.78 = 1,661.18 : x
2. Step 2: Convert to fraction form
   5,123.92/7,685.78 = 1,661.18/x
3. Step 3: Cross multiply
   5,123.92x = 7,685.78 × 1,661.18
4. Step 4: Simplify right side
   5,123.92x = 12,767,464.02
5. Step 5: Solve for x
   x = 12,767,464.02/5,123.92
6. Step 6: Final answer
   x = 2,491.74