Finding the Third Proportional to 139,376 and 210,360

Step by Step Solution

1. Step 1: Write the proportion equation
   139,376 : 210,360 = 210,360 : x
2. Step 2: Convert to fraction form
   139,376/210,360 = 210,360/x
3. Step 3: Cross multiply
   139,376x = 210,360 × 210,360
4. Step 4: Simplify right side
   139,376x = 44,251,329,600
5. Step 5: Solve for x
   x = 44,251,329,600/139,376
6. Step 6: Final answer
   x = 317,496.05