Finding the Third Proportional to 1,188,486 and 1,788,420

Step by Step Solution

1. Step 1: Write the proportion equation
   1,188,486 : 1,788,420 = 1,788,420 : x
2. Step 2: Convert to fraction form
   1,188,486/1,788,420 = 1,788,420/x
3. Step 3: Cross multiply
   1,188,486x = 1,788,420 × 1,788,420
4. Step 4: Simplify right side
   1,188,486x = 3,198,446,096,400
5. Step 5: Solve for x
   x = 3,198,446,096,400/1,188,486
6. Step 6: Final answer
   x = 2,691,193.75