Finding the Third Proportional to 139,870 and 210,966

Step by Step Solution

1. Step 1: Write the proportion equation
   139,870 : 210,966 = 210,966 : x
2. Step 2: Convert to fraction form
   139,870/210,966 = 210,966/x
3. Step 3: Cross multiply
   139,870x = 210,966 × 210,966
4. Step 4: Simplify right side
   139,870x = 44,506,653,156
5. Step 5: Solve for x
   x = 44,506,653,156/139,870
6. Step 6: Final answer
   x = 318,200.14