Finding the Fourth Proportional to 978.17, 1,467.18 and 667.79

Step by Step Solution

1. Step 1: Write the proportion equation
   978.17 : 1,467.18 = 667.79 : x
2. Step 2: Convert to fraction form
   978.17/1,467.18 = 667.79/x
3. Step 3: Cross multiply
   978.17x = 1,467.18 × 667.79
4. Step 4: Simplify right side
   978.17x = 979,768.13
5. Step 5: Solve for x
   x = 979,768.13/978.17
6. Step 6: Final answer
   x = 1,001.63