Finding the Third Proportional to 290,400 and 622,819.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,400 : 622,819.50 = 622,819.50 : x
2. Step 2: Convert to fraction form
   290,400/622,819.50 = 622,819.50/x
3. Step 3: Cross multiply
   290,400x = 622,819.50 × 622,819.50
4. Step 4: Simplify right side
   290,400x = 387,904,129,580.25
5. Step 5: Solve for x
   x = 387,904,129,580.25/290,400
6. Step 6: Final answer
   x = 1,335,758.02