Finding the Third Proportional to 18,618.47 and 39,902.06

Step by Step Solution

1. Step 1: Write the proportion equation
   18,618.47 : 39,902.06 = 39,902.06 : x
2. Step 2: Convert to fraction form
   18,618.47/39,902.06 = 39,902.06/x
3. Step 3: Cross multiply
   18,618.47x = 39,902.06 × 39,902.06
4. Step 4: Simplify right side
   18,618.47x = 1,592,174,591.75
5. Step 5: Solve for x
   x = 1,592,174,591.75/18,618.47
6. Step 6: Final answer
   x = 85,515.87