Finding the Third Proportional to 18,439.31 and 39,946.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,439.31 : 39,946.50 = 39,946.50 : x
2. Step 2: Convert to fraction form
   18,439.31/39,946.50 = 39,946.50/x
3. Step 3: Cross multiply
   18,439.31x = 39,946.50 × 39,946.50
4. Step 4: Simplify right side
   18,439.31x = 1,595,722,862.25
5. Step 5: Solve for x
   x = 1,595,722,862.25/18,439.31
6. Step 6: Final answer
   x = 86,539.17