Finding the Fourth Proportional to 2,185.92, 3,278.24 and 724.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.92 : 3,278.24 = 724.80 : x
2. Step 2: Convert to fraction form
   2,185.92/3,278.24 = 724.80/x
3. Step 3: Cross multiply
   2,185.92x = 3,278.24 × 724.80
4. Step 4: Simplify right side
   2,185.92x = 2,376,068.35
5. Step 5: Solve for x
   x = 2,376,068.35/2,185.92
6. Step 6: Final answer
   x = 1,086.99