Finding the Fourth Proportional to 21,377.94, 29,494.98 and 12,423.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,377.94 : 29,494.98 = 12,423.78 : x
2. Step 2: Convert to fraction form
   21,377.94/29,494.98 = 12,423.78/x
3. Step 3: Cross multiply
   21,377.94x = 29,494.98 × 12,423.78
4. Step 4: Simplify right side
   21,377.94x = 366,439,142.62
5. Step 5: Solve for x
   x = 366,439,142.62/21,377.94
6. Step 6: Final answer
   x = 17,140.99