Finding the Fourth Proportional to 1,280.55, 1,767.24 and 713.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,280.55 : 1,767.24 = 713.42 : x
2. Step 2: Convert to fraction form
   1,280.55/1,767.24 = 713.42/x
3. Step 3: Cross multiply
   1,280.55x = 1,767.24 × 713.42
4. Step 4: Simplify right side
   1,280.55x = 1,260,784.36
5. Step 5: Solve for x
   x = 1,260,784.36/1,280.55
6. Step 6: Final answer
   x = 984.56