Finding the Third Proportional to 105,132 and 215,172

Step by Step Solution

1. Step 1: Write the proportion equation
   105,132 : 215,172 = 215,172 : x
2. Step 2: Convert to fraction form
   105,132/215,172 = 215,172/x
3. Step 3: Cross multiply
   105,132x = 215,172 × 215,172
4. Step 4: Simplify right side
   105,132x = 46,298,989,584
5. Step 5: Solve for x
   x = 46,298,989,584/105,132
6. Step 6: Final answer
   x = 440,389.13