Finding the Third Proportional to 138,950 and 215,290

Step by Step Solution

1. Step 1: Write the proportion equation
   138,950 : 215,290 = 215,290 : x
2. Step 2: Convert to fraction form
   138,950/215,290 = 215,290/x
3. Step 3: Cross multiply
   138,950x = 215,290 × 215,290
4. Step 4: Simplify right side
   138,950x = 46,349,784,100
5. Step 5: Solve for x
   x = 46,349,784,100/138,950
6. Step 6: Final answer
   x = 333,571.67