Finding the Third Proportional to 638,086 and 988,499

Step by Step Solution

1. Step 1: Write the proportion equation
   638,086 : 988,499 = 988,499 : x
2. Step 2: Convert to fraction form
   638,086/988,499 = 988,499/x
3. Step 3: Cross multiply
   638,086x = 988,499 × 988,499
4. Step 4: Simplify right side
   638,086x = 977,130,273,001
5. Step 5: Solve for x
   x = 977,130,273,001/638,086
6. Step 6: Final answer
   x = 1,531,345.73