Finding the Third Proportional to 638,554.50 and 988,812

Step by Step Solution

1. Step 1: Write the proportion equation
   638,554.50 : 988,812 = 988,812 : x
2. Step 2: Convert to fraction form
   638,554.50/988,812 = 988,812/x
3. Step 3: Cross multiply
   638,554.50x = 988,812 × 988,812
4. Step 4: Simplify right side
   638,554.50x = 977,749,171,344
5. Step 5: Solve for x
   x = 977,749,171,344/638,554.50
6. Step 6: Final answer
   x = 1,531,191.42