Finding the Third Proportional to 426,921 and 669,685.50

Step by Step Solution

1. Step 1: Write the proportion equation
   426,921 : 669,685.50 = 669,685.50 : x
2. Step 2: Convert to fraction form
   426,921/669,685.50 = 669,685.50/x
3. Step 3: Cross multiply
   426,921x = 669,685.50 × 669,685.50
4. Step 4: Simplify right side
   426,921x = 448,478,668,910.25
5. Step 5: Solve for x
   x = 448,478,668,910.25/426,921
6. Step 6: Final answer
   x = 1,050,495.69