Finding the Third Proportional to 85,401 and 136,429.50

Step by Step Solution

1. Step 1: Write the proportion equation
   85,401 : 136,429.50 = 136,429.50 : x
2. Step 2: Convert to fraction form
   85,401/136,429.50 = 136,429.50/x
3. Step 3: Cross multiply
   85,401x = 136,429.50 × 136,429.50
4. Step 4: Simplify right side
   85,401x = 18,613,008,470.25
5. Step 5: Solve for x
   x = 18,613,008,470.25/85,401
6. Step 6: Final answer
   x = 217,948.37