Finding the Third Proportional to 428,515.50 and 818,151

Step by Step Solution

1. Step 1: Write the proportion equation
   428,515.50 : 818,151 = 818,151 : x
2. Step 2: Convert to fraction form
   428,515.50/818,151 = 818,151/x
3. Step 3: Cross multiply
   428,515.50x = 818,151 × 818,151
4. Step 4: Simplify right side
   428,515.50x = 669,371,058,801
5. Step 5: Solve for x
   x = 669,371,058,801/428,515.50
6. Step 6: Final answer
   x = 1,562,069.65