Finding the Fourth Proportional to 1,014.10, 1,520.39 and 397.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.10 : 1,520.39 = 397.72 : x
2. Step 2: Convert to fraction form
   1,014.10/1,520.39 = 397.72/x
3. Step 3: Cross multiply
   1,014.10x = 1,520.39 × 397.72
4. Step 4: Simplify right side
   1,014.10x = 604,687.52
5. Step 5: Solve for x
   x = 604,687.52/1,014.10
6. Step 6: Final answer
   x = 596.28