Finding the Third Proportional to 139,990 and 215,169

Step by Step Solution

1. Step 1: Write the proportion equation
   139,990 : 215,169 = 215,169 : x
2. Step 2: Convert to fraction form
   139,990/215,169 = 215,169/x
3. Step 3: Cross multiply
   139,990x = 215,169 × 215,169
4. Step 4: Simplify right side
   139,990x = 46,297,698,561
5. Step 5: Solve for x
   x = 46,297,698,561/139,990
6. Step 6: Final answer
   x = 330,721.47