Finding the Fourth Proportional to 748.72, 1,123.16 and 315.82

Step by Step Solution

1. Step 1: Write the proportion equation
   748.72 : 1,123.16 = 315.82 : x
2. Step 2: Convert to fraction form
   748.72/1,123.16 = 315.82/x
3. Step 3: Cross multiply
   748.72x = 1,123.16 × 315.82
4. Step 4: Simplify right side
   748.72x = 354,716.39
5. Step 5: Solve for x
   x = 354,716.39/748.72
6. Step 6: Final answer
   x = 473.76