Finding the Third Proportional to 63,131 and 138,139

Step by Step Solution

1. Step 1: Write the proportion equation
   63,131 : 138,139 = 138,139 : x
2. Step 2: Convert to fraction form
   63,131/138,139 = 138,139/x
3. Step 3: Cross multiply
   63,131x = 138,139 × 138,139
4. Step 4: Simplify right side
   63,131x = 19,082,383,321
5. Step 5: Solve for x
   x = 19,082,383,321/63,131
6. Step 6: Final answer
   x = 302,266.45