Finding the Third Proportional to 120,739 and 262,221.50

Step by Step Solution

1. Step 1: Write the proportion equation
   120,739 : 262,221.50 = 262,221.50 : x
2. Step 2: Convert to fraction form
   120,739/262,221.50 = 262,221.50/x
3. Step 3: Cross multiply
   120,739x = 262,221.50 × 262,221.50
4. Step 4: Simplify right side
   120,739x = 68,760,115,062.25
5. Step 5: Solve for x
   x = 68,760,115,062.25/120,739
6. Step 6: Final answer
   x = 569,493.83