Finding the Third Proportional to 54,853.88 and 81,921.38

Step by Step Solution

1. Step 1: Write the proportion equation
   54,853.88 : 81,921.38 = 81,921.38 : x
2. Step 2: Convert to fraction form
   54,853.88/81,921.38 = 81,921.38/x
3. Step 3: Cross multiply
   54,853.88x = 81,921.38 × 81,921.38
4. Step 4: Simplify right side
   54,853.88x = 6,711,111,681.89
5. Step 5: Solve for x
   x = 6,711,111,681.89/54,853.88
6. Step 6: Final answer
   x = 122,345.26