Finding the Third Proportional to 269,428.50 and 422,650.50

Step by Step Solution

1. Step 1: Write the proportion equation
   269,428.50 : 422,650.50 = 422,650.50 : x
2. Step 2: Convert to fraction form
   269,428.50/422,650.50 = 422,650.50/x
3. Step 3: Cross multiply
   269,428.50x = 422,650.50 × 422,650.50
4. Step 4: Simplify right side
   269,428.50x = 178,633,445,150.25
5. Step 5: Solve for x
   x = 178,633,445,150.25/269,428.50
6. Step 6: Final answer
   x = 663,008.72