Finding the Third Proportional to 190,287 and 256,315.50

Step by Step Solution

1. Step 1: Write the proportion equation
   190,287 : 256,315.50 = 256,315.50 : x
2. Step 2: Convert to fraction form
   190,287/256,315.50 = 256,315.50/x
3. Step 3: Cross multiply
   190,287x = 256,315.50 × 256,315.50
4. Step 4: Simplify right side
   190,287x = 65,697,635,540.25
5. Step 5: Solve for x
   x = 65,697,635,540.25/190,287
6. Step 6: Final answer
   x = 345,255.51