Finding the Third Proportional to 89,370 and 138,960

Step by Step Solution

1. Step 1: Write the proportion equation
   89,370 : 138,960 = 138,960 : x
2. Step 2: Convert to fraction form
   89,370/138,960 = 138,960/x
3. Step 3: Cross multiply
   89,370x = 138,960 × 138,960
4. Step 4: Simplify right side
   89,370x = 19,309,881,600
5. Step 5: Solve for x
   x = 19,309,881,600/89,370
6. Step 6: Final answer
   x = 216,066.71