Finding the Fourth Proportional to 11,316.05, 16,978.71 and 5,071.87

Step by Step Solution

1. Step 1: Write the proportion equation
   11,316.05 : 16,978.71 = 5,071.87 : x
2. Step 2: Convert to fraction form
   11,316.05/16,978.71 = 5,071.87/x
3. Step 3: Cross multiply
   11,316.05x = 16,978.71 × 5,071.87
4. Step 4: Simplify right side
   11,316.05x = 86,113,754.63
5. Step 5: Solve for x
   x = 86,113,754.63/11,316.05
6. Step 6: Final answer
   x = 7,609.87