Finding the Fourth Proportional to 11,315.88, 16,978.32 and 5,071.56

Step by Step Solution

1. Step 1: Write the proportion equation
   11,315.88 : 16,978.32 = 5,071.56 : x
2. Step 2: Convert to fraction form
   11,315.88/16,978.32 = 5,071.56/x
3. Step 3: Cross multiply
   11,315.88x = 16,978.32 × 5,071.56
4. Step 4: Simplify right side
   11,315.88x = 86,106,568.58
5. Step 5: Solve for x
   x = 86,106,568.58/11,315.88
6. Step 6: Final answer
   x = 7,609.36