Finding the Third Proportional to 11,890 and 18,404.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,890 : 18,404.50 = 18,404.50 : x
2. Step 2: Convert to fraction form
   11,890/18,404.50 = 18,404.50/x
3. Step 3: Cross multiply
   11,890x = 18,404.50 × 18,404.50
4. Step 4: Simplify right side
   11,890x = 338,725,620.25
5. Step 5: Solve for x
   x = 338,725,620.25/11,890
6. Step 6: Final answer
   x = 28,488.28