Finding the Third Proportional to 316,021.50 and 669,222

Step by Step Solution

1. Step 1: Write the proportion equation
   316,021.50 : 669,222 = 669,222 : x
2. Step 2: Convert to fraction form
   316,021.50/669,222 = 669,222/x
3. Step 3: Cross multiply
   316,021.50x = 669,222 × 669,222
4. Step 4: Simplify right side
   316,021.50x = 447,858,085,284
5. Step 5: Solve for x
   x = 447,858,085,284/316,021.50
6. Step 6: Final answer
   x = 1,417,176