Finding the Fourth Proportional to 22,213.36, 30,661.50 and 15,499

Step by Step Solution

1. Step 1: Write the proportion equation
   22,213.36 : 30,661.50 = 15,499 : x
2. Step 2: Convert to fraction form
   22,213.36/30,661.50 = 15,499/x
3. Step 3: Cross multiply
   22,213.36x = 30,661.50 × 15,499
4. Step 4: Simplify right side
   22,213.36x = 475,222,588.50
5. Step 5: Solve for x
   x = 475,222,588.50/22,213.36
6. Step 6: Final answer
   x = 21,393.55