Finding the Third Proportional to 139,068 and 199,123

Step by Step Solution

1. Step 1: Write the proportion equation
   139,068 : 199,123 = 199,123 : x
2. Step 2: Convert to fraction form
   139,068/199,123 = 199,123/x
3. Step 3: Cross multiply
   139,068x = 199,123 × 199,123
4. Step 4: Simplify right side
   139,068x = 39,649,969,129
5. Step 5: Solve for x
   x = 39,649,969,129/139,068
6. Step 6: Final answer
   x = 285,112.10