Finding the Fourth Proportional to 2,550.72, 3,521.60 and 2,021.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,550.72 : 3,521.60 = 2,021.76 : x
2. Step 2: Convert to fraction form
   2,550.72/3,521.60 = 2,021.76/x
3. Step 3: Cross multiply
   2,550.72x = 3,521.60 × 2,021.76
4. Step 4: Simplify right side
   2,550.72x = 7,119,830.02
5. Step 5: Solve for x
   x = 7,119,830.02/2,550.72
6. Step 6: Final answer
   x = 2,791.30