Finding the Third Proportional to 638,298 and 945,123

Step by Step Solution

1. Step 1: Write the proportion equation
   638,298 : 945,123 = 945,123 : x
2. Step 2: Convert to fraction form
   638,298/945,123 = 945,123/x
3. Step 3: Cross multiply
   638,298x = 945,123 × 945,123
4. Step 4: Simplify right side
   638,298x = 893,257,485,129
5. Step 5: Solve for x
   x = 893,257,485,129/638,298
6. Step 6: Final answer
   x = 1,399,436.45