Finding the Fourth Proportional to 753.72, 1,128.18 and 406.56

Step by Step Solution

1. Step 1: Write the proportion equation
   753.72 : 1,128.18 = 406.56 : x
2. Step 2: Convert to fraction form
   753.72/1,128.18 = 406.56/x
3. Step 3: Cross multiply
   753.72x = 1,128.18 × 406.56
4. Step 4: Simplify right side
   753.72x = 458,672.86
5. Step 5: Solve for x
   x = 458,672.86/753.72
6. Step 6: Final answer
   x = 608.55