Finding the Third Proportional to 139,342 and 209,328

Step by Step Solution

1. Step 1: Write the proportion equation
   139,342 : 209,328 = 209,328 : x
2. Step 2: Convert to fraction form
   139,342/209,328 = 209,328/x
3. Step 3: Cross multiply
   139,342x = 209,328 × 209,328
4. Step 4: Simplify right side
   139,342x = 43,818,211,584
5. Step 5: Solve for x
   x = 43,818,211,584/139,342
6. Step 6: Final answer
   x = 314,465.21