Finding the Fourth Proportional to 19,020.72, 26,239.72 and 12,308.50

Step by Step Solution

1. Step 1: Write the proportion equation
   19,020.72 : 26,239.72 = 12,308.50 : x
2. Step 2: Convert to fraction form
   19,020.72/26,239.72 = 12,308.50/x
3. Step 3: Cross multiply
   19,020.72x = 26,239.72 × 12,308.50
4. Step 4: Simplify right side
   19,020.72x = 322,971,593.62
5. Step 5: Solve for x
   x = 322,971,593.62/19,020.72
6. Step 6: Final answer
   x = 16,979.99