Finding the Fourth Proportional to 21,659.12, 29,889.72 and 12,706.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,659.12 : 29,889.72 = 12,706.82 : x
2. Step 2: Convert to fraction form
   21,659.12/29,889.72 = 12,706.82/x
3. Step 3: Cross multiply
   21,659.12x = 29,889.72 × 12,706.82
4. Step 4: Simplify right side
   21,659.12x = 379,803,142.44
5. Step 5: Solve for x
   x = 379,803,142.44/21,659.12
6. Step 6: Final answer
   x = 17,535.49