Finding the Fourth Proportional to 1,665.20, 2,496.38 and 787.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.20 : 2,496.38 = 787.25 : x
2. Step 2: Convert to fraction form
   1,665.20/2,496.38 = 787.25/x
3. Step 3: Cross multiply
   1,665.20x = 2,496.38 × 787.25
4. Step 4: Simplify right side
   1,665.20x = 1,965,258.74
5. Step 5: Solve for x
   x = 1,965,258.74/1,665.20
6. Step 6: Final answer
   x = 1,180.20