Finding the Fourth Proportional to 820.72, 1,131.84 and 738.71

Step by Step Solution

1. Step 1: Write the proportion equation
   820.72 : 1,131.84 = 738.71 : x
2. Step 2: Convert to fraction form
   820.72/1,131.84 = 738.71/x
3. Step 3: Cross multiply
   820.72x = 1,131.84 × 738.71
4. Step 4: Simplify right side
   820.72x = 836,101.53
5. Step 5: Solve for x
   x = 836,101.53/820.72
6. Step 6: Final answer
   x = 1,018.74