Finding the Third Proportional to 573.05 and 859.78

Step by Step Solution

1. Step 1: Write the proportion equation
   573.05 : 859.78 = 859.78 : x
2. Step 2: Convert to fraction form
   573.05/859.78 = 859.78/x
3. Step 3: Cross multiply
   573.05x = 859.78 × 859.78
4. Step 4: Simplify right side
   573.05x = 739,223.80
5. Step 5: Solve for x
   x = 739,223.80/573.05
6. Step 6: Final answer
   x = 1,289.99