Finding the Third Proportional to 101,128.50 and 220,401

Step by Step Solution

1. Step 1: Write the proportion equation
   101,128.50 : 220,401 = 220,401 : x
2. Step 2: Convert to fraction form
   101,128.50/220,401 = 220,401/x
3. Step 3: Cross multiply
   101,128.50x = 220,401 × 220,401
4. Step 4: Simplify right side
   101,128.50x = 48,576,600,801
5. Step 5: Solve for x
   x = 48,576,600,801/101,128.50
6. Step 6: Final answer
   x = 480,345.31