Finding the Fourth Proportional to 998.33, 1,494.05 and 688.10

Step by Step Solution

1. Step 1: Write the proportion equation
   998.33 : 1,494.05 = 688.10 : x
2. Step 2: Convert to fraction form
   998.33/1,494.05 = 688.10/x
3. Step 3: Cross multiply
   998.33x = 1,494.05 × 688.10
4. Step 4: Simplify right side
   998.33x = 1,028,044.89
5. Step 5: Solve for x
   x = 1,028,044.89/998.33
6. Step 6: Final answer
   x = 1,029.77