Finding the Fourth Proportional to 21,860.53, 30,167.54 and 12,429.67

Step by Step Solution

1. Step 1: Write the proportion equation
   21,860.53 : 30,167.54 = 12,429.67 : x
2. Step 2: Convert to fraction form
   21,860.53/30,167.54 = 12,429.67/x
3. Step 3: Cross multiply
   21,860.53x = 30,167.54 × 12,429.67
4. Step 4: Simplify right side
   21,860.53x = 374,972,504.76
5. Step 5: Solve for x
   x = 374,972,504.76/21,860.53
6. Step 6: Final answer
   x = 17,152.95