Finding the Third Proportional to 139,215.75 and 212,088

Step by Step Solution

1. Step 1: Write the proportion equation
   139,215.75 : 212,088 = 212,088 : x
2. Step 2: Convert to fraction form
   139,215.75/212,088 = 212,088/x
3. Step 3: Cross multiply
   139,215.75x = 212,088 × 212,088
4. Step 4: Simplify right side
   139,215.75x = 44,981,319,744
5. Step 5: Solve for x
   x = 44,981,319,744/139,215.75
6. Step 6: Final answer
   x = 323,105.11