Finding the Third Proportional to 139,090 and 209,284

Step by Step Solution

1. Step 1: Write the proportion equation
   139,090 : 209,284 = 209,284 : x
2. Step 2: Convert to fraction form
   139,090/209,284 = 209,284/x
3. Step 3: Cross multiply
   139,090x = 209,284 × 209,284
4. Step 4: Simplify right side
   139,090x = 43,799,792,656
5. Step 5: Solve for x
   x = 43,799,792,656/139,090
6. Step 6: Final answer
   x = 314,902.53