Finding the Third Proportional to 11,138.34 and 15,131.39

Step by Step Solution

1. Step 1: Write the proportion equation
   11,138.34 : 15,131.39 = 15,131.39 : x
2. Step 2: Convert to fraction form
   11,138.34/15,131.39 = 15,131.39/x
3. Step 3: Cross multiply
   11,138.34x = 15,131.39 × 15,131.39
4. Step 4: Simplify right side
   11,138.34x = 228,958,982.25
5. Step 5: Solve for x
   x = 228,958,982.25/11,138.34
6. Step 6: Final answer
   x = 20,555.93