Finding the Third Proportional to 489,243 and 778,333.50

Step by Step Solution

1. Step 1: Write the proportion equation
   489,243 : 778,333.50 = 778,333.50 : x
2. Step 2: Convert to fraction form
   489,243/778,333.50 = 778,333.50/x
3. Step 3: Cross multiply
   489,243x = 778,333.50 × 778,333.50
4. Step 4: Simplify right side
   489,243x = 605,803,037,222.25
5. Step 5: Solve for x
   x = 605,803,037,222.25/489,243
6. Step 6: Final answer
   x = 1,238,245.69