Finding the Fourth Proportional to 3,651.96, 5,037.78 and 2,158.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,651.96 : 5,037.78 = 2,158.80 : x
2. Step 2: Convert to fraction form
   3,651.96/5,037.78 = 2,158.80/x
3. Step 3: Cross multiply
   3,651.96x = 5,037.78 × 2,158.80
4. Step 4: Simplify right side
   3,651.96x = 10,875,559.46
5. Step 5: Solve for x
   x = 10,875,559.46/3,651.96
6. Step 6: Final answer
   x = 2,978.01