Finding the Fourth Proportional to 2,809.72, 4,211.88 and 2,569.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,809.72 : 4,211.88 = 2,569.12 : x
2. Step 2: Convert to fraction form
   2,809.72/4,211.88 = 2,569.12/x
3. Step 3: Cross multiply
   2,809.72x = 4,211.88 × 2,569.12
4. Step 4: Simplify right side
   2,809.72x = 10,820,825.15
5. Step 5: Solve for x
   x = 10,820,825.15/2,809.72
6. Step 6: Final answer
   x = 3,851.21