Finding the Third Proportional to 215,158 and 331,810

Step by Step Solution

1. Step 1: Write the proportion equation
   215,158 : 331,810 = 331,810 : x
2. Step 2: Convert to fraction form
   215,158/331,810 = 331,810/x
3. Step 3: Cross multiply
   215,158x = 331,810 × 331,810
4. Step 4: Simplify right side
   215,158x = 110,097,876,100
5. Step 5: Solve for x
   x = 110,097,876,100/215,158
6. Step 6: Final answer
   x = 511,707.10