Finding the Third Proportional to 139,578 and 199,359

Step by Step Solution

1. Step 1: Write the proportion equation
   139,578 : 199,359 = 199,359 : x
2. Step 2: Convert to fraction form
   139,578/199,359 = 199,359/x
3. Step 3: Cross multiply
   139,578x = 199,359 × 199,359
4. Step 4: Simplify right side
   139,578x = 39,744,010,881
5. Step 5: Solve for x
   x = 39,744,010,881/139,578
6. Step 6: Final answer
   x = 284,744.09