Finding the Fourth Proportional to 1,111.02, 1,665.69 and 672.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.02 : 1,665.69 = 672.17 : x
2. Step 2: Convert to fraction form
   1,111.02/1,665.69 = 672.17/x
3. Step 3: Cross multiply
   1,111.02x = 1,665.69 × 672.17
4. Step 4: Simplify right side
   1,111.02x = 1,119,626.85
5. Step 5: Solve for x
   x = 1,119,626.85/1,111.02
6. Step 6: Final answer
   x = 1,007.75