Finding the Fourth Proportional to 14,419.72, 19,898.40 and 8,131.72

Step by Step Solution

1. Step 1: Write the proportion equation
   14,419.72 : 19,898.40 = 8,131.72 : x
2. Step 2: Convert to fraction form
   14,419.72/19,898.40 = 8,131.72/x
3. Step 3: Cross multiply
   14,419.72x = 19,898.40 × 8,131.72
4. Step 4: Simplify right side
   14,419.72x = 161,808,217.25
5. Step 5: Solve for x
   x = 161,808,217.25/14,419.72
6. Step 6: Final answer
   x = 11,221.31