Finding the Third Proportional to 12,879.50 and 17,415.75

Step by Step Solution

1. Step 1: Write the proportion equation
   12,879.50 : 17,415.75 = 17,415.75 : x
2. Step 2: Convert to fraction form
   12,879.50/17,415.75 = 17,415.75/x
3. Step 3: Cross multiply
   12,879.50x = 17,415.75 × 17,415.75
4. Step 4: Simplify right side
   12,879.50x = 303,308,348.06
5. Step 5: Solve for x
   x = 303,308,348.06/12,879.50
6. Step 6: Final answer
   x = 23,549.70