Finding the Fourth Proportional to 1,280.01, 1,766.46 and 712.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,280.01 : 1,766.46 = 712.89 : x
2. Step 2: Convert to fraction form
   1,280.01/1,766.46 = 712.89/x
3. Step 3: Cross multiply
   1,280.01x = 1,766.46 × 712.89
4. Step 4: Simplify right side
   1,280.01x = 1,259,292.31
5. Step 5: Solve for x
   x = 1,259,292.31/1,280.01
6. Step 6: Final answer
   x = 983.82