Finding the Third Proportional to 139,756 and 215,080

Step by Step Solution

1. Step 1: Write the proportion equation
   139,756 : 215,080 = 215,080 : x
2. Step 2: Convert to fraction form
   139,756/215,080 = 215,080/x
3. Step 3: Cross multiply
   139,756x = 215,080 × 215,080
4. Step 4: Simplify right side
   139,756x = 46,259,406,400
5. Step 5: Solve for x
   x = 46,259,406,400/139,756
6. Step 6: Final answer
   x = 331,001.22