Finding the Fourth Proportional to 11,316.88, 16,979.82 and 5,072.56

Step by Step Solution

1. Step 1: Write the proportion equation
   11,316.88 : 16,979.82 = 5,072.56 : x
2. Step 2: Convert to fraction form
   11,316.88/16,979.82 = 5,072.56/x
3. Step 3: Cross multiply
   11,316.88x = 16,979.82 × 5,072.56
4. Step 4: Simplify right side
   11,316.88x = 86,131,155.74
5. Step 5: Solve for x
   x = 86,131,155.74/11,316.88
6. Step 6: Final answer
   x = 7,610.86