Finding the Fourth Proportional to 820.41, 1,132.83 and 572.55

Step by Step Solution

1. Step 1: Write the proportion equation
   820.41 : 1,132.83 = 572.55 : x
2. Step 2: Convert to fraction form
   820.41/1,132.83 = 572.55/x
3. Step 3: Cross multiply
   820.41x = 1,132.83 × 572.55
4. Step 4: Simplify right side
   820.41x = 648,601.82
5. Step 5: Solve for x
   x = 648,601.82/820.41
6. Step 6: Final answer
   x = 790.58