Finding the Third Proportional to 139,860 and 215,100

Step by Step Solution

1. Step 1: Write the proportion equation
   139,860 : 215,100 = 215,100 : x
2. Step 2: Convert to fraction form
   139,860/215,100 = 215,100/x
3. Step 3: Cross multiply
   139,860x = 215,100 × 215,100
4. Step 4: Simplify right side
   139,860x = 46,268,010,000
5. Step 5: Solve for x
   x = 46,268,010,000/139,860
6. Step 6: Final answer
   x = 330,816.60