Finding the Fourth Proportional to 1,012.32, 1,518.96 and 396.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.32 : 1,518.96 = 396.72 : x
2. Step 2: Convert to fraction form
   1,012.32/1,518.96 = 396.72/x
3. Step 3: Cross multiply
   1,012.32x = 1,518.96 × 396.72
4. Step 4: Simplify right side
   1,012.32x = 602,601.81
5. Step 5: Solve for x
   x = 602,601.81/1,012.32
6. Step 6: Final answer
   x = 595.27