Finding the Third Proportional to 15,145.31 and 21,679.45

Step by Step Solution

1. Step 1: Write the proportion equation
   15,145.31 : 21,679.45 = 21,679.45 : x
2. Step 2: Convert to fraction form
   15,145.31/21,679.45 = 21,679.45/x
3. Step 3: Cross multiply
   15,145.31x = 21,679.45 × 21,679.45
4. Step 4: Simplify right side
   15,145.31x = 469,998,687.80
5. Step 5: Solve for x
   x = 469,998,687.80/15,145.31
6. Step 6: Final answer
   x = 31,032.62