Finding the Third Proportional to 638,738.50 and 1,390,877

Step by Step Solution

1. Step 1: Write the proportion equation
   638,738.50 : 1,390,877 = 1,390,877 : x
2. Step 2: Convert to fraction form
   638,738.50/1,390,877 = 1,390,877/x
3. Step 3: Cross multiply
   638,738.50x = 1,390,877 × 1,390,877
4. Step 4: Simplify right side
   638,738.50x = 1,934,538,829,129
5. Step 5: Solve for x
   x = 1,934,538,829,129/638,738.50
6. Step 6: Final answer
   x = 3,028,686.75