Finding the Fourth Proportional to 1,118.40, 1,676.16 and 630.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.40 : 1,676.16 = 630.72 : x
2. Step 2: Convert to fraction form
   1,118.40/1,676.16 = 630.72/x
3. Step 3: Cross multiply
   1,118.40x = 1,676.16 × 630.72
4. Step 4: Simplify right side
   1,118.40x = 1,057,187.64
5. Step 5: Solve for x
   x = 1,057,187.64/1,118.40
6. Step 6: Final answer
   x = 945.27