Finding the Fourth Proportional to 21,598.55, 29,805.86 and 12,170.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,598.55 : 29,805.86 = 12,170.15 : x
2. Step 2: Convert to fraction form
   21,598.55/29,805.86 = 12,170.15/x
3. Step 3: Cross multiply
   21,598.55x = 29,805.86 × 12,170.15
4. Step 4: Simplify right side
   21,598.55x = 362,741,668.48
5. Step 5: Solve for x
   x = 362,741,668.48/21,598.55
6. Step 6: Final answer
   x = 16,794.73