Finding the Third Proportional to 139,328 and 215,808

Step by Step Solution

1. Step 1: Write the proportion equation
   139,328 : 215,808 = 215,808 : x
2. Step 2: Convert to fraction form
   139,328/215,808 = 215,808/x
3. Step 3: Cross multiply
   139,328x = 215,808 × 215,808
4. Step 4: Simplify right side
   139,328x = 46,573,092,864
5. Step 5: Solve for x
   x = 46,573,092,864/139,328
6. Step 6: Final answer
   x = 334,269.44