Finding the Third Proportional to 139,869 and 210,964

Step by Step Solution

1. Step 1: Write the proportion equation
   139,869 : 210,964 = 210,964 : x
2. Step 2: Convert to fraction form
   139,869/210,964 = 210,964/x
3. Step 3: Cross multiply
   139,869x = 210,964 × 210,964
4. Step 4: Simplify right side
   139,869x = 44,505,809,296
5. Step 5: Solve for x
   x = 44,505,809,296/139,869
6. Step 6: Final answer
   x = 318,196.38