Finding the Third Proportional to 66,404 and 138,960

Step by Step Solution

1. Step 1: Write the proportion equation
   66,404 : 138,960 = 138,960 : x
2. Step 2: Convert to fraction form
   66,404/138,960 = 138,960/x
3. Step 3: Cross multiply
   66,404x = 138,960 × 138,960
4. Step 4: Simplify right side
   66,404x = 19,309,881,600
5. Step 5: Solve for x
   x = 19,309,881,600/66,404
6. Step 6: Final answer
   x = 290,793.95