Finding the Third Proportional to 128,215.50 and 199,044

Step by Step Solution

1. Step 1: Write the proportion equation
   128,215.50 : 199,044 = 199,044 : x
2. Step 2: Convert to fraction form
   128,215.50/199,044 = 199,044/x
3. Step 3: Cross multiply
   128,215.50x = 199,044 × 199,044
4. Step 4: Simplify right side
   128,215.50x = 39,618,513,936
5. Step 5: Solve for x
   x = 39,618,513,936/128,215.50
6. Step 6: Final answer
   x = 308,999.41