Finding the Third Proportional to 521.44 and 827.72

Step by Step Solution

1. Step 1: Write the proportion equation
   521.44 : 827.72 = 827.72 : x
2. Step 2: Convert to fraction form
   521.44/827.72 = 827.72/x
3. Step 3: Cross multiply
   521.44x = 827.72 × 827.72
4. Step 4: Simplify right side
   521.44x = 685,118.33
5. Step 5: Solve for x
   x = 685,118.33/521.44
6. Step 6: Final answer
   x = 1,313.90