Finding the Third Proportional to 12,690 and 27,328.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,690 : 27,328.50 = 27,328.50 : x
2. Step 2: Convert to fraction form
   12,690/27,328.50 = 27,328.50/x
3. Step 3: Cross multiply
   12,690x = 27,328.50 × 27,328.50
4. Step 4: Simplify right side
   12,690x = 746,846,912.25
5. Step 5: Solve for x
   x = 746,846,912.25/12,690
6. Step 6: Final answer
   x = 58,853.18