Finding the Third Proportional to 18,856.55 and 39,900.09

Step by Step Solution

1. Step 1: Write the proportion equation
   18,856.55 : 39,900.09 = 39,900.09 : x
2. Step 2: Convert to fraction form
   18,856.55/39,900.09 = 39,900.09/x
3. Step 3: Cross multiply
   18,856.55x = 39,900.09 × 39,900.09
4. Step 4: Simplify right side
   18,856.55x = 1,592,017,481.26
5. Step 5: Solve for x
   x = 1,592,017,481.26/18,856.55
6. Step 6: Final answer
   x = 84,427.84