Finding the Fourth Proportional to 21,375.84, 29,493.98 and 12,418.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,375.84 : 29,493.98 = 12,418.72 : x
2. Step 2: Convert to fraction form
   21,375.84/29,493.98 = 12,418.72/x
3. Step 3: Cross multiply
   21,375.84x = 29,493.98 × 12,418.72
4. Step 4: Simplify right side
   21,375.84x = 366,277,479.31
5. Step 5: Solve for x
   x = 366,277,479.31/21,375.84
6. Step 6: Final answer
   x = 17,135.12