Finding the Fourth Proportional to 1,988.82, 2,982.18 and 672.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,988.82 : 2,982.18 = 672.12 : x
2. Step 2: Convert to fraction form
   1,988.82/2,982.18 = 672.12/x
3. Step 3: Cross multiply
   1,988.82x = 2,982.18 × 672.12
4. Step 4: Simplify right side
   1,988.82x = 2,004,382.82
5. Step 5: Solve for x
   x = 2,004,382.82/1,988.82
6. Step 6: Final answer
   x = 1,007.83