Finding the Third Proportional to 428,498.50 and 818,117

Step by Step Solution

1. Step 1: Write the proportion equation
   428,498.50 : 818,117 = 818,117 : x
2. Step 2: Convert to fraction form
   428,498.50/818,117 = 818,117/x
3. Step 3: Cross multiply
   428,498.50x = 818,117 × 818,117
4. Step 4: Simplify right side
   428,498.50x = 669,315,425,689
5. Step 5: Solve for x
   x = 669,315,425,689/428,498.50
6. Step 6: Final answer
   x = 1,562,001.79