Finding the Third Proportional to 89,318.25 and 138,238.88

Step by Step Solution

1. Step 1: Write the proportion equation
   89,318.25 : 138,238.88 = 138,238.88 : x
2. Step 2: Convert to fraction form
   89,318.25/138,238.88 = 138,238.88/x
3. Step 3: Cross multiply
   89,318.25x = 138,238.88 × 138,238.88
4. Step 4: Simplify right side
   89,318.25x = 19,109,986,561.27
5. Step 5: Solve for x
   x = 19,109,986,561.27/89,318.25
6. Step 6: Final answer
   x = 213,953.88