Finding the Third Proportional to 12,807 and 20,090

Step by Step Solution

1. Step 1: Write the proportion equation
   12,807 : 20,090 = 20,090 : x
2. Step 2: Convert to fraction form
   12,807/20,090 = 20,090/x
3. Step 3: Cross multiply
   12,807x = 20,090 × 20,090
4. Step 4: Simplify right side
   12,807x = 403,608,100
5. Step 5: Solve for x
   x = 403,608,100/12,807
6. Step 6: Final answer
   x = 31,514.65