Finding the Fourth Proportional to 2,418.53, 3,627.72 and 687.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,418.53 : 3,627.72 = 687.15 : x
2. Step 2: Convert to fraction form
   2,418.53/3,627.72 = 687.15/x
3. Step 3: Cross multiply
   2,418.53x = 3,627.72 × 687.15
4. Step 4: Simplify right side
   2,418.53x = 2,492,787.80
5. Step 5: Solve for x
   x = 2,492,787.80/2,418.53
6. Step 6: Final answer
   x = 1,030.71