Finding the Third Proportional to 215,672 and 308,816

Step by Step Solution

1. Step 1: Write the proportion equation
   215,672 : 308,816 = 308,816 : x
2. Step 2: Convert to fraction form
   215,672/308,816 = 308,816/x
3. Step 3: Cross multiply
   215,672x = 308,816 × 308,816
4. Step 4: Simplify right side
   215,672x = 95,367,321,856
5. Step 5: Solve for x
   x = 95,367,321,856/215,672
6. Step 6: Final answer
   x = 442,186.85