Finding the Fourth Proportional to 820.33, 1,131.74 and 540.72

Step by Step Solution

1. Step 1: Write the proportion equation
   820.33 : 1,131.74 = 540.72 : x
2. Step 2: Convert to fraction form
   820.33/1,131.74 = 540.72/x
3. Step 3: Cross multiply
   820.33x = 1,131.74 × 540.72
4. Step 4: Simplify right side
   820.33x = 611,954.45
5. Step 5: Solve for x
   x = 611,954.45/820.33
6. Step 6: Final answer
   x = 745.99