Finding the Third Proportional to 142,878 and 215,613

Step by Step Solution

1. Step 1: Write the proportion equation
   142,878 : 215,613 = 215,613 : x
2. Step 2: Convert to fraction form
   142,878/215,613 = 215,613/x
3. Step 3: Cross multiply
   142,878x = 215,613 × 215,613
4. Step 4: Simplify right side
   142,878x = 46,488,965,769
5. Step 5: Solve for x
   x = 46,488,965,769/142,878
6. Step 6: Final answer
   x = 325,375.26