Finding the Fourth Proportional to 2,521.30, 3,777.90 and 2,108.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,521.30 : 3,777.90 = 2,108.20 : x
2. Step 2: Convert to fraction form
   2,521.30/3,777.90 = 2,108.20/x
3. Step 3: Cross multiply
   2,521.30x = 3,777.90 × 2,108.20
4. Step 4: Simplify right side
   2,521.30x = 7,964,568.78
5. Step 5: Solve for x
   x = 7,964,568.78/2,521.30
6. Step 6: Final answer
   x = 3,158.91