Finding the Third Proportional to 638,780 and 1,363,258

Step by Step Solution

1. Step 1: Write the proportion equation
   638,780 : 1,363,258 = 1,363,258 : x
2. Step 2: Convert to fraction form
   638,780/1,363,258 = 1,363,258/x
3. Step 3: Cross multiply
   638,780x = 1,363,258 × 1,363,258
4. Step 4: Simplify right side
   638,780x = 1,858,472,374,564
5. Step 5: Solve for x
   x = 1,858,472,374,564/638,780
6. Step 6: Final answer
   x = 2,909,409.15