Finding the Third Proportional to 221,391 and 345,910.50

Step by Step Solution

1. Step 1: Write the proportion equation
   221,391 : 345,910.50 = 345,910.50 : x
2. Step 2: Convert to fraction form
   221,391/345,910.50 = 345,910.50/x
3. Step 3: Cross multiply
   221,391x = 345,910.50 × 345,910.50
4. Step 4: Simplify right side
   221,391x = 119,654,074,010.25
5. Step 5: Solve for x
   x = 119,654,074,010.25/221,391
6. Step 6: Final answer
   x = 540,464.94