Finding the Third Proportional to 428,518.50 and 818,157

Step by Step Solution

1. Step 1: Write the proportion equation
   428,518.50 : 818,157 = 818,157 : x
2. Step 2: Convert to fraction form
   428,518.50/818,157 = 818,157/x
3. Step 3: Cross multiply
   428,518.50x = 818,157 × 818,157
4. Step 4: Simplify right side
   428,518.50x = 669,380,876,649
5. Step 5: Solve for x
   x = 669,380,876,649/428,518.50
6. Step 6: Final answer
   x = 1,562,081.63