Finding the Fourth Proportional to 15,697, 21,674.82 and 13,580.20

Step by Step Solution

1. Step 1: Write the proportion equation
   15,697 : 21,674.82 = 13,580.20 : x
2. Step 2: Convert to fraction form
   15,697/21,674.82 = 13,580.20/x
3. Step 3: Cross multiply
   15,697x = 21,674.82 × 13,580.20
4. Step 4: Simplify right side
   15,697x = 294,348,390.56
5. Step 5: Solve for x
   x = 294,348,390.56/15,697
6. Step 6: Final answer
   x = 18,751.89