Finding the Fourth Proportional to 1,018.74, 1,527.15 and 402.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.74 : 1,527.15 = 402.89 : x
2. Step 2: Convert to fraction form
   1,018.74/1,527.15 = 402.89/x
3. Step 3: Cross multiply
   1,018.74x = 1,527.15 × 402.89
4. Step 4: Simplify right side
   1,018.74x = 615,265.83
5. Step 5: Solve for x
   x = 615,265.83/1,018.74
6. Step 6: Final answer
   x = 603.95