Finding the Third Proportional to 13,279.50 and 20,409.75

Step by Step Solution

1. Step 1: Write the proportion equation
   13,279.50 : 20,409.75 = 20,409.75 : x
2. Step 2: Convert to fraction form
   13,279.50/20,409.75 = 20,409.75/x
3. Step 3: Cross multiply
   13,279.50x = 20,409.75 × 20,409.75
4. Step 4: Simplify right side
   13,279.50x = 416,557,895.06
5. Step 5: Solve for x
   x = 416,557,895.06/13,279.50
6. Step 6: Final answer
   x = 31,368.49