Finding the Third Proportional to 103,686 and 215,154

Step by Step Solution

1. Step 1: Write the proportion equation
   103,686 : 215,154 = 215,154 : x
2. Step 2: Convert to fraction form
   103,686/215,154 = 215,154/x
3. Step 3: Cross multiply
   103,686x = 215,154 × 215,154
4. Step 4: Simplify right side
   103,686x = 46,291,243,716
5. Step 5: Solve for x
   x = 46,291,243,716/103,686
6. Step 6: Final answer
   x = 446,456.07