Finding the Third Proportional to 312,822 and 660,109.50

Step by Step Solution

1. Step 1: Write the proportion equation
   312,822 : 660,109.50 = 660,109.50 : x
2. Step 2: Convert to fraction form
   312,822/660,109.50 = 660,109.50/x
3. Step 3: Cross multiply
   312,822x = 660,109.50 × 660,109.50
4. Step 4: Simplify right side
   312,822x = 435,744,551,990.25
5. Step 5: Solve for x
   x = 435,744,551,990.25/312,822
6. Step 6: Final answer
   x = 1,392,947.27