Finding the Fourth Proportional to 980.52, 1,470.21 and 672.72

Step by Step Solution

1. Step 1: Write the proportion equation
   980.52 : 1,470.21 = 672.72 : x
2. Step 2: Convert to fraction form
   980.52/1,470.21 = 672.72/x
3. Step 3: Cross multiply
   980.52x = 1,470.21 × 672.72
4. Step 4: Simplify right side
   980.52x = 989,039.67
5. Step 5: Solve for x
   x = 989,039.67/980.52
6. Step 6: Final answer
   x = 1,008.69