Finding the Fourth Proportional to 1,027.98, 1,540.89 and 450.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,027.98 : 1,540.89 = 450.18 : x
2. Step 2: Convert to fraction form
   1,027.98/1,540.89 = 450.18/x
3. Step 3: Cross multiply
   1,027.98x = 1,540.89 × 450.18
4. Step 4: Simplify right side
   1,027.98x = 693,677.86
5. Step 5: Solve for x
   x = 693,677.86/1,027.98
6. Step 6: Final answer
   x = 674.80