Finding the Fourth Proportional to 10,775.40, 16,147.47 and 7,440.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,775.40 : 16,147.47 = 7,440.21 : x
2. Step 2: Convert to fraction form
   10,775.40/16,147.47 = 7,440.21/x
3. Step 3: Cross multiply
   10,775.40x = 16,147.47 × 7,440.21
4. Step 4: Simplify right side
   10,775.40x = 120,140,567.77
5. Step 5: Solve for x
   x = 120,140,567.77/10,775.40
6. Step 6: Final answer
   x = 11,149.52