Finding the Third Proportional to 66,289.50 and 136,404

Step by Step Solution

1. Step 1: Write the proportion equation
   66,289.50 : 136,404 = 136,404 : x
2. Step 2: Convert to fraction form
   66,289.50/136,404 = 136,404/x
3. Step 3: Cross multiply
   66,289.50x = 136,404 × 136,404
4. Step 4: Simplify right side
   66,289.50x = 18,606,051,216
5. Step 5: Solve for x
   x = 18,606,051,216/66,289.50
6. Step 6: Final answer
   x = 280,678.71