Finding the Third Proportional to 638,691 and 888,040.50

Step by Step Solution

1. Step 1: Write the proportion equation
   638,691 : 888,040.50 = 888,040.50 : x
2. Step 2: Convert to fraction form
   638,691/888,040.50 = 888,040.50/x
3. Step 3: Cross multiply
   638,691x = 888,040.50 × 888,040.50
4. Step 4: Simplify right side
   638,691x = 788,615,929,640.25
5. Step 5: Solve for x
   x = 788,615,929,640.25/638,691
6. Step 6: Final answer
   x = 1,234,737.81