Finding the Fourth Proportional to 1,061.22, 1,590.21 and 573.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.22 : 1,590.21 = 573.78 : x
2. Step 2: Convert to fraction form
   1,061.22/1,590.21 = 573.78/x
3. Step 3: Cross multiply
   1,061.22x = 1,590.21 × 573.78
4. Step 4: Simplify right side
   1,061.22x = 912,430.69
5. Step 5: Solve for x
   x = 912,430.69/1,061.22
6. Step 6: Final answer
   x = 859.79