Finding the Fourth Proportional to 1,015.35, 1,522.72 and 398.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.35 : 1,522.72 = 398.92 : x
2. Step 2: Convert to fraction form
   1,015.35/1,522.72 = 398.92/x
3. Step 3: Cross multiply
   1,015.35x = 1,522.72 × 398.92
4. Step 4: Simplify right side
   1,015.35x = 607,443.46
5. Step 5: Solve for x
   x = 607,443.46/1,015.35
6. Step 6: Final answer
   x = 598.26