Finding the Fourth Proportional to 2,829.16, 3,900.90 and 2,621.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,829.16 : 3,900.90 = 2,621.80 : x
2. Step 2: Convert to fraction form
   2,829.16/3,900.90 = 2,621.80/x
3. Step 3: Cross multiply
   2,829.16x = 3,900.90 × 2,621.80
4. Step 4: Simplify right side
   2,829.16x = 10,227,379.62
5. Step 5: Solve for x
   x = 10,227,379.62/2,829.16
6. Step 6: Final answer
   x = 3,614.99