Finding the Third Proportional to 570.38 and 720.56

Step by Step Solution

1. Step 1: Write the proportion equation
   570.38 : 720.56 = 720.56 : x
2. Step 2: Convert to fraction form
   570.38/720.56 = 720.56/x
3. Step 3: Cross multiply
   570.38x = 720.56 × 720.56
4. Step 4: Simplify right side
   570.38x = 519,210.32
5. Step 5: Solve for x
   x = 519,210.32/570.38
6. Step 6: Final answer
   x = 910.30