Finding the Third Proportional to 139,410 and 210,843

Step by Step Solution

1. Step 1: Write the proportion equation
   139,410 : 210,843 = 210,843 : x
2. Step 2: Convert to fraction form
   139,410/210,843 = 210,843/x
3. Step 3: Cross multiply
   139,410x = 210,843 × 210,843
4. Step 4: Simplify right side
   139,410x = 44,454,770,649
5. Step 5: Solve for x
   x = 44,454,770,649/139,410
6. Step 6: Final answer
   x = 318,877.92