Finding the Fourth Proportional to 1,018.55, 1,528.17 and 402.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.55 : 1,528.17 = 402.54 : x
2. Step 2: Convert to fraction form
   1,018.55/1,528.17 = 402.54/x
3. Step 3: Cross multiply
   1,018.55x = 1,528.17 × 402.54
4. Step 4: Simplify right side
   1,018.55x = 615,155.21
5. Step 5: Solve for x
   x = 615,155.21/1,018.55
6. Step 6: Final answer
   x = 603.95