Finding the Third Proportional to 309,847.50 and 656,916

Step by Step Solution

1. Step 1: Write the proportion equation
   309,847.50 : 656,916 = 656,916 : x
2. Step 2: Convert to fraction form
   309,847.50/656,916 = 656,916/x
3. Step 3: Cross multiply
   309,847.50x = 656,916 × 656,916
4. Step 4: Simplify right side
   309,847.50x = 431,538,631,056
5. Step 5: Solve for x
   x = 431,538,631,056/309,847.50
6. Step 6: Final answer
   x = 1,392,745.24