Finding the Fourth Proportional to 2,160.72, 3,241.32 and 699.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.72 : 3,241.32 = 699.60 : x
2. Step 2: Convert to fraction form
   2,160.72/3,241.32 = 699.60/x
3. Step 3: Cross multiply
   2,160.72x = 3,241.32 × 699.60
4. Step 4: Simplify right side
   2,160.72x = 2,267,627.47
5. Step 5: Solve for x
   x = 2,267,627.47/2,160.72
6. Step 6: Final answer
   x = 1,049.48