Finding the Fourth Proportional to 1,253.57, 1,729.72 and 787.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,253.57 : 1,729.72 = 787.49 : x
2. Step 2: Convert to fraction form
   1,253.57/1,729.72 = 787.49/x
3. Step 3: Cross multiply
   1,253.57x = 1,729.72 × 787.49
4. Step 4: Simplify right side
   1,253.57x = 1,362,137.20
5. Step 5: Solve for x
   x = 1,362,137.20/1,253.57
6. Step 6: Final answer
   x = 1,086.61