Finding the Fourth Proportional to 2,799.72, 3,859.56 and 2,209.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,799.72 : 3,859.56 = 2,209.20 : x
2. Step 2: Convert to fraction form
   2,799.72/3,859.56 = 2,209.20/x
3. Step 3: Cross multiply
   2,799.72x = 3,859.56 × 2,209.20
4. Step 4: Simplify right side
   2,799.72x = 8,526,539.95
5. Step 5: Solve for x
   x = 8,526,539.95/2,799.72
6. Step 6: Final answer
   x = 3,045.50