Finding the Third Proportional to 139,191 and 216,078

Step by Step Solution

1. Step 1: Write the proportion equation
   139,191 : 216,078 = 216,078 : x
2. Step 2: Convert to fraction form
   139,191/216,078 = 216,078/x
3. Step 3: Cross multiply
   139,191x = 216,078 × 216,078
4. Step 4: Simplify right side
   139,191x = 46,689,702,084
5. Step 5: Solve for x
   x = 46,689,702,084/139,191
6. Step 6: Final answer
   x = 335,436.21