Finding the Fourth Proportional to 980.58, 1,469.52 and 720.72

Step by Step Solution

1. Step 1: Write the proportion equation
   980.58 : 1,469.52 = 720.72 : x
2. Step 2: Convert to fraction form
   980.58/1,469.52 = 720.72/x
3. Step 3: Cross multiply
   980.58x = 1,469.52 × 720.72
4. Step 4: Simplify right side
   980.58x = 1,059,114.56
5. Step 5: Solve for x
   x = 1,059,114.56/980.58
6. Step 6: Final answer
   x = 1,080.09