Finding the Fourth Proportional to 758.17, 1,046.55 and 478.72

Step by Step Solution

1. Step 1: Write the proportion equation
   758.17 : 1,046.55 = 478.72 : x
2. Step 2: Convert to fraction form
   758.17/1,046.55 = 478.72/x
3. Step 3: Cross multiply
   758.17x = 1,046.55 × 478.72
4. Step 4: Simplify right side
   758.17x = 501,004.42
5. Step 5: Solve for x
   x = 501,004.42/758.17
6. Step 6: Final answer
   x = 660.81