Finding the Third Proportional to 391,269 and 621,922.50

Step by Step Solution

1. Step 1: Write the proportion equation
   391,269 : 621,922.50 = 621,922.50 : x
2. Step 2: Convert to fraction form
   391,269/621,922.50 = 621,922.50/x
3. Step 3: Cross multiply
   391,269x = 621,922.50 × 621,922.50
4. Step 4: Simplify right side
   391,269x = 386,787,596,006.25
5. Step 5: Solve for x
   x = 386,787,596,006.25/391,269
6. Step 6: Final answer
   x = 988,546.49