Finding the Third Proportional to 290,874 and 608,221.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,874 : 608,221.50 = 608,221.50 : x
2. Step 2: Convert to fraction form
   290,874/608,221.50 = 608,221.50/x
3. Step 3: Cross multiply
   290,874x = 608,221.50 × 608,221.50
4. Step 4: Simplify right side
   290,874x = 369,933,393,062.25
5. Step 5: Solve for x
   x = 369,933,393,062.25/290,874
6. Step 6: Final answer
   x = 1,271,799.45