Finding the Third Proportional to 56,138 and 123,340

Step by Step Solution

1. Step 1: Write the proportion equation
   56,138 : 123,340 = 123,340 : x
2. Step 2: Convert to fraction form
   56,138/123,340 = 123,340/x
3. Step 3: Cross multiply
   56,138x = 123,340 × 123,340
4. Step 4: Simplify right side
   56,138x = 15,212,755,600
5. Step 5: Solve for x
   x = 15,212,755,600/56,138
6. Step 6: Final answer
   x = 270,988.56