Finding the Third Proportional to 12,902.81 and 18,856.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,902.81 : 18,856.31 = 18,856.31 : x
2. Step 2: Convert to fraction form
   12,902.81/18,856.31 = 18,856.31/x
3. Step 3: Cross multiply
   12,902.81x = 18,856.31 × 18,856.31
4. Step 4: Simplify right side
   12,902.81x = 355,560,521.10
5. Step 5: Solve for x
   x = 355,560,521.10/12,902.81
6. Step 6: Final answer
   x = 27,556.82