Finding the Fourth Proportional to 21,860.93, 30,167.88 and 12,429.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,860.93 : 30,167.88 = 12,429.49 : x
2. Step 2: Convert to fraction form
   21,860.93/30,167.88 = 12,429.49/x
3. Step 3: Cross multiply
   21,860.93x = 30,167.88 × 12,429.49
4. Step 4: Simplify right side
   21,860.93x = 374,971,307.33
5. Step 5: Solve for x
   x = 374,971,307.33/21,860.93
6. Step 6: Final answer
   x = 17,152.58