Finding the Third Proportional to 215,758.63 and 323,638

Step by Step Solution

1. Step 1: Write the proportion equation
   215,758.63 : 323,638 = 323,638 : x
2. Step 2: Convert to fraction form
   215,758.63/323,638 = 323,638/x
3. Step 3: Cross multiply
   215,758.63x = 323,638 × 323,638
4. Step 4: Simplify right side
   215,758.63x = 104,741,555,044
5. Step 5: Solve for x
   x = 104,741,555,044/215,758.63
6. Step 6: Final answer
   x = 485,457.09