Finding the Fourth Proportional to 1,118.91, 1,544.34 and 646.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.91 : 1,544.34 = 646.89 : x
2. Step 2: Convert to fraction form
   1,118.91/1,544.34 = 646.89/x
3. Step 3: Cross multiply
   1,118.91x = 1,544.34 × 646.89
4. Step 4: Simplify right side
   1,118.91x = 999,018.10
5. Step 5: Solve for x
   x = 999,018.10/1,118.91
6. Step 6: Final answer
   x = 892.85