Finding the Third Proportional to 721.88 and 1,528.72

Step by Step Solution

1. Step 1: Write the proportion equation
   721.88 : 1,528.72 = 1,528.72 : x
2. Step 2: Convert to fraction form
   721.88/1,528.72 = 1,528.72/x
3. Step 3: Cross multiply
   721.88x = 1,528.72 × 1,528.72
4. Step 4: Simplify right side
   721.88x = 2,336,975.05
5. Step 5: Solve for x
   x = 2,336,975.05/721.88
6. Step 6: Final answer
   x = 3,237.34