Finding the Fourth Proportional to 1,215.37, 1,676.82 and 718.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.37 : 1,676.82 = 718.03 : x
2. Step 2: Convert to fraction form
   1,215.37/1,676.82 = 718.03/x
3. Step 3: Cross multiply
   1,215.37x = 1,676.82 × 718.03
4. Step 4: Simplify right side
   1,215.37x = 1,204,007.06
5. Step 5: Solve for x
   x = 1,204,007.06/1,215.37
6. Step 6: Final answer
   x = 990.65