Finding the Third Proportional to 12,980.25 and 20,339.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,980.25 : 20,339.25 = 20,339.25 : x
2. Step 2: Convert to fraction form
   12,980.25/20,339.25 = 20,339.25/x
3. Step 3: Cross multiply
   12,980.25x = 20,339.25 × 20,339.25
4. Step 4: Simplify right side
   12,980.25x = 413,685,090.56
5. Step 5: Solve for x
   x = 413,685,090.56/12,980.25
6. Step 6: Final answer
   x = 31,870.35