Finding the Fourth Proportional to 15,345.49, 21,085 and 12,196.21

Step by Step Solution

1. Step 1: Write the proportion equation
   15,345.49 : 21,085 = 12,196.21 : x
2. Step 2: Convert to fraction form
   15,345.49/21,085 = 12,196.21/x
3. Step 3: Cross multiply
   15,345.49x = 21,085 × 12,196.21
4. Step 4: Simplify right side
   15,345.49x = 257,157,087.85
5. Step 5: Solve for x
   x = 257,157,087.85/15,345.49
6. Step 6: Final answer
   x = 16,757.83