Finding the Fourth Proportional to 678.93, 1,016.37 and 667.32

Step by Step Solution

1. Step 1: Write the proportion equation
   678.93 : 1,016.37 = 667.32 : x
2. Step 2: Convert to fraction form
   678.93/1,016.37 = 667.32/x
3. Step 3: Cross multiply
   678.93x = 1,016.37 × 667.32
4. Step 4: Simplify right side
   678.93x = 678,244.03
5. Step 5: Solve for x
   x = 678,244.03/678.93
6. Step 6: Final answer
   x = 998.99