Finding the Third Proportional to 638,685 and 888,043.50

Step by Step Solution

1. Step 1: Write the proportion equation
   638,685 : 888,043.50 = 888,043.50 : x
2. Step 2: Convert to fraction form
   638,685/888,043.50 = 888,043.50/x
3. Step 3: Cross multiply
   638,685x = 888,043.50 × 888,043.50
4. Step 4: Simplify right side
   638,685x = 788,621,257,892.25
5. Step 5: Solve for x
   x = 788,621,257,892.25/638,685
6. Step 6: Final answer
   x = 1,234,757.76