Finding the Third Proportional to 11,891.81 and 18,840.09

Step by Step Solution

1. Step 1: Write the proportion equation
   11,891.81 : 18,840.09 = 18,840.09 : x
2. Step 2: Convert to fraction form
   11,891.81/18,840.09 = 18,840.09/x
3. Step 3: Cross multiply
   11,891.81x = 18,840.09 × 18,840.09
4. Step 4: Simplify right side
   11,891.81x = 354,949,132.51
5. Step 5: Solve for x
   x = 354,949,132.51/11,891.81
6. Step 6: Final answer
   x = 29,848.19