Finding the Fourth Proportional to 11,243.61, 16,860.02 and 5,315.56

Step by Step Solution

1. Step 1: Write the proportion equation
   11,243.61 : 16,860.02 = 5,315.56 : x
2. Step 2: Convert to fraction form
   11,243.61/16,860.02 = 5,315.56/x
3. Step 3: Cross multiply
   11,243.61x = 16,860.02 × 5,315.56
4. Step 4: Simplify right side
   11,243.61x = 89,620,447.91
5. Step 5: Solve for x
   x = 89,620,447.91/11,243.61
6. Step 6: Final answer
   x = 7,970.79