Finding the Third Proportional to 215,997 and 290,774.25

Step by Step Solution

1. Step 1: Write the proportion equation
   215,997 : 290,774.25 = 290,774.25 : x
2. Step 2: Convert to fraction form
   215,997/290,774.25 = 290,774.25/x
3. Step 3: Cross multiply
   215,997x = 290,774.25 × 290,774.25
4. Step 4: Simplify right side
   215,997x = 84,549,664,463.06
5. Step 5: Solve for x
   x = 84,549,664,463.06/215,997
6. Step 6: Final answer
   x = 391,439.07