Finding the Fourth Proportional to 13,421.72, 18,521.88 and 7,453.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,421.72 : 18,521.88 = 7,453.42 : x
2. Step 2: Convert to fraction form
   13,421.72/18,521.88 = 7,453.42/x
3. Step 3: Cross multiply
   13,421.72x = 18,521.88 × 7,453.42
4. Step 4: Simplify right side
   13,421.72x = 138,051,350.83
5. Step 5: Solve for x
   x = 138,051,350.83/13,421.72
6. Step 6: Final answer
   x = 10,285.67