Finding the Third Proportional to 287,132.50 and 422,767.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,132.50 : 422,767.50 = 422,767.50 : x
2. Step 2: Convert to fraction form
   287,132.50/422,767.50 = 422,767.50/x
3. Step 3: Cross multiply
   287,132.50x = 422,767.50 × 422,767.50
4. Step 4: Simplify right side
   287,132.50x = 178,732,359,056.25
5. Step 5: Solve for x
   x = 178,732,359,056.25/287,132.50
6. Step 6: Final answer
   x = 622,473.45