Finding the Fourth Proportional to 1,302.25, 1,797.15 and 712.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,302.25 : 1,797.15 = 712.78 : x
2. Step 2: Convert to fraction form
   1,302.25/1,797.15 = 712.78/x
3. Step 3: Cross multiply
   1,302.25x = 1,797.15 × 712.78
4. Step 4: Simplify right side
   1,302.25x = 1,280,972.15
5. Step 5: Solve for x
   x = 1,280,972.15/1,302.25
6. Step 6: Final answer
   x = 983.66