Finding the Fourth Proportional to 1,015.55, 1,522.71 and 398.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.55 : 1,522.71 = 398.52 : x
2. Step 2: Convert to fraction form
   1,015.55/1,522.71 = 398.52/x
3. Step 3: Cross multiply
   1,015.55x = 1,522.71 × 398.52
4. Step 4: Simplify right side
   1,015.55x = 606,830.39
5. Step 5: Solve for x
   x = 606,830.39/1,015.55
6. Step 6: Final answer
   x = 597.54