Finding the Third Proportional to 139,991 and 216,175

Step by Step Solution

1. Step 1: Write the proportion equation
   139,991 : 216,175 = 216,175 : x
2. Step 2: Convert to fraction form
   139,991/216,175 = 216,175/x
3. Step 3: Cross multiply
   139,991x = 216,175 × 216,175
4. Step 4: Simplify right side
   139,991x = 46,731,630,625
5. Step 5: Solve for x
   x = 46,731,630,625/139,991
6. Step 6: Final answer
   x = 333,818.82