Finding the Fourth Proportional to 21,868.55, 30,173.22 and 12,306.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,868.55 : 30,173.22 = 12,306.56 : x
2. Step 2: Convert to fraction form
   21,868.55/30,173.22 = 12,306.56/x
3. Step 3: Cross multiply
   21,868.55x = 30,173.22 × 12,306.56
4. Step 4: Simplify right side
   21,868.55x = 371,328,617.76
5. Step 5: Solve for x
   x = 371,328,617.76/21,868.55
6. Step 6: Final answer
   x = 16,980.03