Finding the Third Proportional to 638,320 and 945,155

Step by Step Solution

1. Step 1: Write the proportion equation
   638,320 : 945,155 = 945,155 : x
2. Step 2: Convert to fraction form
   638,320/945,155 = 945,155/x
3. Step 3: Cross multiply
   638,320x = 945,155 × 945,155
4. Step 4: Simplify right side
   638,320x = 893,317,974,025
5. Step 5: Solve for x
   x = 893,317,974,025/638,320
6. Step 6: Final answer
   x = 1,399,482.98