Finding the Third Proportional to 215,152 and 315,816

Step by Step Solution

1. Step 1: Write the proportion equation
   215,152 : 315,816 = 315,816 : x
2. Step 2: Convert to fraction form
   215,152/315,816 = 315,816/x
3. Step 3: Cross multiply
   215,152x = 315,816 × 315,816
4. Step 4: Simplify right side
   215,152x = 99,739,745,856
5. Step 5: Solve for x
   x = 99,739,745,856/215,152
6. Step 6: Final answer
   x = 463,578.06