Finding the Fourth Proportional to 22,519.05, 31,078.20 and 13,087

Step by Step Solution

1. Step 1: Write the proportion equation
   22,519.05 : 31,078.20 = 13,087 : x
2. Step 2: Convert to fraction form
   22,519.05/31,078.20 = 13,087/x
3. Step 3: Cross multiply
   22,519.05x = 31,078.20 × 13,087
4. Step 4: Simplify right side
   22,519.05x = 406,720,403.40
5. Step 5: Solve for x
   x = 406,720,403.40/22,519.05
6. Step 6: Final answer
   x = 18,061.17