Finding the Third Proportional to 84,405 and 131,215.50

Step by Step Solution

1. Step 1: Write the proportion equation
   84,405 : 131,215.50 = 131,215.50 : x
2. Step 2: Convert to fraction form
   84,405/131,215.50 = 131,215.50/x
3. Step 3: Cross multiply
   84,405x = 131,215.50 × 131,215.50
4. Step 4: Simplify right side
   84,405x = 17,217,507,440.25
5. Step 5: Solve for x
   x = 17,217,507,440.25/84,405
6. Step 6: Final answer
   x = 203,986.82