Finding the Third Proportional to 272,308.50 and 422,401.50

Step by Step Solution

1. Step 1: Write the proportion equation
   272,308.50 : 422,401.50 = 422,401.50 : x
2. Step 2: Convert to fraction form
   272,308.50/422,401.50 = 422,401.50/x
3. Step 3: Cross multiply
   272,308.50x = 422,401.50 × 422,401.50
4. Step 4: Simplify right side
   272,308.50x = 178,423,027,202.25
5. Step 5: Solve for x
   x = 178,423,027,202.25/272,308.50
6. Step 6: Final answer
   x = 655,223.86