Finding the Fourth Proportional to 1,106.51, 1,658.69 and 672.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,106.51 : 1,658.69 = 672.89 : x
2. Step 2: Convert to fraction form
   1,106.51/1,658.69 = 672.89/x
3. Step 3: Cross multiply
   1,106.51x = 1,658.69 × 672.89
4. Step 4: Simplify right side
   1,106.51x = 1,116,112.55
5. Step 5: Solve for x
   x = 1,116,112.55/1,106.51
6. Step 6: Final answer
   x = 1,008.68