Finding the Third Proportional to 221,649 and 351,028.50

Step by Step Solution

1. Step 1: Write the proportion equation
   221,649 : 351,028.50 = 351,028.50 : x
2. Step 2: Convert to fraction form
   221,649/351,028.50 = 351,028.50/x
3. Step 3: Cross multiply
   221,649x = 351,028.50 × 351,028.50
4. Step 4: Simplify right side
   221,649x = 123,221,007,812.25
5. Step 5: Solve for x
   x = 123,221,007,812.25/221,649
6. Step 6: Final answer
   x = 555,928.55