Finding the Third Proportional to 310,943.25 and 678,168

Step by Step Solution

1. Step 1: Write the proportion equation
   310,943.25 : 678,168 = 678,168 : x
2. Step 2: Convert to fraction form
   310,943.25/678,168 = 678,168/x
3. Step 3: Cross multiply
   310,943.25x = 678,168 × 678,168
4. Step 4: Simplify right side
   310,943.25x = 459,911,836,224
5. Step 5: Solve for x
   x = 459,911,836,224/310,943.25
6. Step 6: Final answer
   x = 1,479,086.09