Finding the Fourth Proportional to 21,685.42, 29,926.56 and 12,254.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,685.42 : 29,926.56 = 12,254.59 : x
2. Step 2: Convert to fraction form
   21,685.42/29,926.56 = 12,254.59/x
3. Step 3: Cross multiply
   21,685.42x = 29,926.56 × 12,254.59
4. Step 4: Simplify right side
   21,685.42x = 366,737,722.91
5. Step 5: Solve for x
   x = 366,737,722.91/21,685.42
6. Step 6: Final answer
   x = 16,911.72