Finding the Third Proportional to 638,289 and 945,109.50

Step by Step Solution

1. Step 1: Write the proportion equation
   638,289 : 945,109.50 = 945,109.50 : x
2. Step 2: Convert to fraction form
   638,289/945,109.50 = 945,109.50/x
3. Step 3: Cross multiply
   638,289x = 945,109.50 × 945,109.50
4. Step 4: Simplify right side
   638,289x = 893,231,966,990.25
5. Step 5: Solve for x
   x = 893,231,966,990.25/638,289
6. Step 6: Final answer
   x = 1,399,416.20