Finding the Third Proportional to 31,131 and 68,310

Step by Step Solution

1. Step 1: Write the proportion equation
   31,131 : 68,310 = 68,310 : x
2. Step 2: Convert to fraction form
   31,131/68,310 = 68,310/x
3. Step 3: Cross multiply
   31,131x = 68,310 × 68,310
4. Step 4: Simplify right side
   31,131x = 4,666,256,100
5. Step 5: Solve for x
   x = 4,666,256,100/31,131
6. Step 6: Final answer
   x = 149,890.98