Finding the Third Proportional to 387,639 and 822,244.50

Step by Step Solution

1. Step 1: Write the proportion equation
   387,639 : 822,244.50 = 822,244.50 : x
2. Step 2: Convert to fraction form
   387,639/822,244.50 = 822,244.50/x
3. Step 3: Cross multiply
   387,639x = 822,244.50 × 822,244.50
4. Step 4: Simplify right side
   387,639x = 676,086,017,780.25
5. Step 5: Solve for x
   x = 676,086,017,780.25/387,639
6. Step 6: Final answer
   x = 1,744,112.48