Finding the Fourth Proportional to 748.72, 1,123.08 and 228.72

Step by Step Solution

1. Step 1: Write the proportion equation
   748.72 : 1,123.08 = 228.72 : x
2. Step 2: Convert to fraction form
   748.72/1,123.08 = 228.72/x
3. Step 3: Cross multiply
   748.72x = 1,123.08 × 228.72
4. Step 4: Simplify right side
   748.72x = 256,870.86
5. Step 5: Solve for x
   x = 256,870.86/748.72
6. Step 6: Final answer
   x = 343.08