Finding the Third Proportional to 638,087.50 and 988,503

Step by Step Solution

1. Step 1: Write the proportion equation
   638,087.50 : 988,503 = 988,503 : x
2. Step 2: Convert to fraction form
   638,087.50/988,503 = 988,503/x
3. Step 3: Cross multiply
   638,087.50x = 988,503 × 988,503
4. Step 4: Simplify right side
   638,087.50x = 977,138,181,009
5. Step 5: Solve for x
   x = 977,138,181,009/638,087.50
6. Step 6: Final answer
   x = 1,531,354.53