Finding the Third Proportional to 305,221.50 and 661,290

Step by Step Solution

1. Step 1: Write the proportion equation
   305,221.50 : 661,290 = 661,290 : x
2. Step 2: Convert to fraction form
   305,221.50/661,290 = 661,290/x
3. Step 3: Cross multiply
   305,221.50x = 661,290 × 661,290
4. Step 4: Simplify right side
   305,221.50x = 437,304,464,100
5. Step 5: Solve for x
   x = 437,304,464,100/305,221.50
6. Step 6: Final answer
   x = 1,432,744.63