Finding the Third Proportional to 215,257.50 and 300,942

Step by Step Solution

1. Step 1: Write the proportion equation
   215,257.50 : 300,942 = 300,942 : x
2. Step 2: Convert to fraction form
   215,257.50/300,942 = 300,942/x
3. Step 3: Cross multiply
   215,257.50x = 300,942 × 300,942
4. Step 4: Simplify right side
   215,257.50x = 90,566,087,364
5. Step 5: Solve for x
   x = 90,566,087,364/215,257.50
6. Step 6: Final answer
   x = 420,733.71