Finding the Third Proportional to 637,780.50 and 988,960.50

Step by Step Solution

1. Step 1: Write the proportion equation
   637,780.50 : 988,960.50 = 988,960.50 : x
2. Step 2: Convert to fraction form
   637,780.50/988,960.50 = 988,960.50/x
3. Step 3: Cross multiply
   637,780.50x = 988,960.50 × 988,960.50
4. Step 4: Simplify right side
   637,780.50x = 978,042,870,560.25
5. Step 5: Solve for x
   x = 978,042,870,560.25/637,780.50
6. Step 6: Final answer
   x = 1,533,510.15