Finding the Third Proportional to 12,690 and 18,037.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,690 : 18,037.50 = 18,037.50 : x
2. Step 2: Convert to fraction form
   12,690/18,037.50 = 18,037.50/x
3. Step 3: Cross multiply
   12,690x = 18,037.50 × 18,037.50
4. Step 4: Simplify right side
   12,690x = 325,351,406.25
5. Step 5: Solve for x
   x = 325,351,406.25/12,690
6. Step 6: Final answer
   x = 25,638.41