Finding the Third Proportional to 67,087.50 and 138,429

Step by Step Solution

1. Step 1: Write the proportion equation
   67,087.50 : 138,429 = 138,429 : x
2. Step 2: Convert to fraction form
   67,087.50/138,429 = 138,429/x
3. Step 3: Cross multiply
   67,087.50x = 138,429 × 138,429
4. Step 4: Simplify right side
   67,087.50x = 19,162,588,041
5. Step 5: Solve for x
   x = 19,162,588,041/67,087.50
6. Step 6: Final answer
   x = 285,635.74