Finding the Third Proportional to 638,742 and 1,390,884

Step by Step Solution

1. Step 1: Write the proportion equation
   638,742 : 1,390,884 = 1,390,884 : x
2. Step 2: Convert to fraction form
   638,742/1,390,884 = 1,390,884/x
3. Step 3: Cross multiply
   638,742x = 1,390,884 × 1,390,884
4. Step 4: Simplify right side
   638,742x = 1,934,558,301,456
5. Step 5: Solve for x
   x = 1,934,558,301,456/638,742
6. Step 6: Final answer
   x = 3,028,700.64