Finding the Third Proportional to 20,599.31 and 39,558.38

Step by Step Solution

1. Step 1: Write the proportion equation
   20,599.31 : 39,558.38 = 39,558.38 : x
2. Step 2: Convert to fraction form
   20,599.31/39,558.38 = 39,558.38/x
3. Step 3: Cross multiply
   20,599.31x = 39,558.38 × 39,558.38
4. Step 4: Simplify right side
   20,599.31x = 1,564,865,032.64
5. Step 5: Solve for x
   x = 1,564,865,032.64/20,599.31
6. Step 6: Final answer
   x = 75,966.86