Finding the Third Proportional to 287,131.50 and 422,766

Step by Step Solution

1. Step 1: Write the proportion equation
   287,131.50 : 422,766 = 422,766 : x
2. Step 2: Convert to fraction form
   287,131.50/422,766 = 422,766/x
3. Step 3: Cross multiply
   287,131.50x = 422,766 × 422,766
4. Step 4: Simplify right side
   287,131.50x = 178,731,090,756
5. Step 5: Solve for x
   x = 178,731,090,756/287,131.50
6. Step 6: Final answer
   x = 622,471.20