Finding the Fourth Proportional to 21,955.48, 30,298.25 and 12,395.55

Step by Step Solution

1. Step 1: Write the proportion equation
   21,955.48 : 30,298.25 = 12,395.55 : x
2. Step 2: Convert to fraction form
   21,955.48/30,298.25 = 12,395.55/x
3. Step 3: Cross multiply
   21,955.48x = 30,298.25 × 12,395.55
4. Step 4: Simplify right side
   21,955.48x = 375,563,472.79
5. Step 5: Solve for x
   x = 375,563,472.79/21,955.48
6. Step 6: Final answer
   x = 17,105.68