Finding the Third Proportional to 139,072 and 299,110

Step by Step Solution

1. Step 1: Write the proportion equation
   139,072 : 299,110 = 299,110 : x
2. Step 2: Convert to fraction form
   139,072/299,110 = 299,110/x
3. Step 3: Cross multiply
   139,072x = 299,110 × 299,110
4. Step 4: Simplify right side
   139,072x = 89,466,792,100
5. Step 5: Solve for x
   x = 89,466,792,100/139,072
6. Step 6: Final answer
   x = 643,312.76