Finding the Third Proportional to 20,031.13 and 31,139.25

Step by Step Solution

1. Step 1: Write the proportion equation
   20,031.13 : 31,139.25 = 31,139.25 : x
2. Step 2: Convert to fraction form
   20,031.13/31,139.25 = 31,139.25/x
3. Step 3: Cross multiply
   20,031.13x = 31,139.25 × 31,139.25
4. Step 4: Simplify right side
   20,031.13x = 969,652,890.56
5. Step 5: Solve for x
   x = 969,652,890.56/20,031.13
6. Step 6: Final answer
   x = 48,407.31