Finding the Third Proportional to 290,338.50 and 625,171.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,338.50 : 625,171.50 = 625,171.50 : x
2. Step 2: Convert to fraction form
   290,338.50/625,171.50 = 625,171.50/x
3. Step 3: Cross multiply
   290,338.50x = 625,171.50 × 625,171.50
4. Step 4: Simplify right side
   290,338.50x = 390,839,404,412.25
5. Step 5: Solve for x
   x = 390,839,404,412.25/290,338.50
6. Step 6: Final answer
   x = 1,346,150.80