Finding the Fourth Proportional to 978.63, 1,467.12 and 669.72

Step by Step Solution

1. Step 1: Write the proportion equation
   978.63 : 1,467.12 = 669.72 : x
2. Step 2: Convert to fraction form
   978.63/1,467.12 = 669.72/x
3. Step 3: Cross multiply
   978.63x = 1,467.12 × 669.72
4. Step 4: Simplify right side
   978.63x = 982,559.61
5. Step 5: Solve for x
   x = 982,559.61/978.63
6. Step 6: Final answer
   x = 1,004.02