Finding the Third Proportional to 638,086.50 and 988,501.50

Step by Step Solution

1. Step 1: Write the proportion equation
   638,086.50 : 988,501.50 = 988,501.50 : x
2. Step 2: Convert to fraction form
   638,086.50/988,501.50 = 988,501.50/x
3. Step 3: Cross multiply
   638,086.50x = 988,501.50 × 988,501.50
4. Step 4: Simplify right side
   638,086.50x = 977,135,215,502.25
5. Step 5: Solve for x
   x = 977,135,215,502.25/638,086.50
6. Step 6: Final answer
   x = 1,531,352.28