Finding the Third Proportional to 139,436 and 210,465

Step by Step Solution

1. Step 1: Write the proportion equation
   139,436 : 210,465 = 210,465 : x
2. Step 2: Convert to fraction form
   139,436/210,465 = 210,465/x
3. Step 3: Cross multiply
   139,436x = 210,465 × 210,465
4. Step 4: Simplify right side
   139,436x = 44,295,516,225
5. Step 5: Solve for x
   x = 44,295,516,225/139,436
6. Step 6: Final answer
   x = 317,676.33