Finding the Third Proportional to 345,426.50 and 814,255

Step by Step Solution

1. Step 1: Write the proportion equation
   345,426.50 : 814,255 = 814,255 : x
2. Step 2: Convert to fraction form
   345,426.50/814,255 = 814,255/x
3. Step 3: Cross multiply
   345,426.50x = 814,255 × 814,255
4. Step 4: Simplify right side
   345,426.50x = 663,011,205,025
5. Step 5: Solve for x
   x = 663,011,205,025/345,426.50
6. Step 6: Final answer
   x = 1,919,398.79