Finding the Third Proportional to 290,514 and 396,063.75

Step by Step Solution

1. Step 1: Write the proportion equation
   290,514 : 396,063.75 = 396,063.75 : x
2. Step 2: Convert to fraction form
   290,514/396,063.75 = 396,063.75/x
3. Step 3: Cross multiply
   290,514x = 396,063.75 × 396,063.75
4. Step 4: Simplify right side
   290,514x = 156,866,494,064.06
5. Step 5: Solve for x
   x = 156,866,494,064.06/290,514
6. Step 6: Final answer
   x = 539,961.91