Finding the Fourth Proportional to 21,687.42, 29,929.37 and 12,256.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,687.42 : 29,929.37 = 12,256.59 : x
2. Step 2: Convert to fraction form
   21,687.42/29,929.37 = 12,256.59/x
3. Step 3: Cross multiply
   21,687.42x = 29,929.37 × 12,256.59
4. Step 4: Simplify right side
   21,687.42x = 366,831,955.77
5. Step 5: Solve for x
   x = 366,831,955.77/21,687.42
6. Step 6: Final answer
   x = 16,914.50