Finding the Fourth Proportional to 11,421.69, 15,766.29 and 7,443.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,421.69 : 15,766.29 = 7,443.78 : x
2. Step 2: Convert to fraction form
   11,421.69/15,766.29 = 7,443.78/x
3. Step 3: Cross multiply
   11,421.69x = 15,766.29 × 7,443.78
4. Step 4: Simplify right side
   11,421.69x = 117,360,794.18
5. Step 5: Solve for x
   x = 117,360,794.18/11,421.69
6. Step 6: Final answer
   x = 10,275.26