Finding the Third Proportional to 215,636 and 308,772

Step by Step Solution

1. Step 1: Write the proportion equation
   215,636 : 308,772 = 308,772 : x
2. Step 2: Convert to fraction form
   215,636/308,772 = 308,772/x
3. Step 3: Cross multiply
   215,636x = 308,772 × 308,772
4. Step 4: Simplify right side
   215,636x = 95,340,147,984
5. Step 5: Solve for x
   x = 95,340,147,984/215,636
6. Step 6: Final answer
   x = 442,134.65