Finding the Fourth Proportional to 5,680.72, 8,521.32 and 2,560.16

Step by Step Solution

1. Step 1: Write the proportion equation
   5,680.72 : 8,521.32 = 2,560.16 : x
2. Step 2: Convert to fraction form
   5,680.72/8,521.32 = 2,560.16/x
3. Step 3: Cross multiply
   5,680.72x = 8,521.32 × 2,560.16
4. Step 4: Simplify right side
   5,680.72x = 21,815,942.61
5. Step 5: Solve for x
   x = 21,815,942.61/5,680.72
6. Step 6: Final answer
   x = 3,840.35