Finding the Fourth Proportional to 13,521.45, 18,658.54 and 7,471.43

Step by Step Solution

1. Step 1: Write the proportion equation
   13,521.45 : 18,658.54 = 7,471.43 : x
2. Step 2: Convert to fraction form
   13,521.45/18,658.54 = 7,471.43/x
3. Step 3: Cross multiply
   13,521.45x = 18,658.54 × 7,471.43
4. Step 4: Simplify right side
   13,521.45x = 139,406,031.50
5. Step 5: Solve for x
   x = 139,406,031.50/13,521.45
6. Step 6: Final answer
   x = 10,309.99