Finding the Third Proportional to 290,042.25 and 622,928.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,042.25 : 622,928.50 = 622,928.50 : x
2. Step 2: Convert to fraction form
   290,042.25/622,928.50 = 622,928.50/x
3. Step 3: Cross multiply
   290,042.25x = 622,928.50 × 622,928.50
4. Step 4: Simplify right side
   290,042.25x = 388,039,916,112.25
5. Step 5: Solve for x
   x = 388,039,916,112.25/290,042.25
6. Step 6: Final answer
   x = 1,337,873.76