Finding the Third Proportional to 389.91 and 573.56

Step by Step Solution

1. Step 1: Write the proportion equation
   389.91 : 573.56 = 573.56 : x
2. Step 2: Convert to fraction form
   389.91/573.56 = 573.56/x
3. Step 3: Cross multiply
   389.91x = 573.56 × 573.56
4. Step 4: Simplify right side
   389.91x = 328,973.94
5. Step 5: Solve for x
   x = 328,973.94/389.91
6. Step 6: Final answer
   x = 843.73