Finding the Third Proportional to 311,832 and 660,471.75

Step by Step Solution

1. Step 1: Write the proportion equation
   311,832 : 660,471.75 = 660,471.75 : x
2. Step 2: Convert to fraction form
   311,832/660,471.75 = 660,471.75/x
3. Step 3: Cross multiply
   311,832x = 660,471.75 × 660,471.75
4. Step 4: Simplify right side
   311,832x = 436,222,932,548.06
5. Step 5: Solve for x
   x = 436,222,932,548.06/311,832
6. Step 6: Final answer
   x = 1,398,903.68