Finding the Fourth Proportional to 11,709, 17,557.74 and 5,131.08

Step by Step Solution

1. Step 1: Write the proportion equation
   11,709 : 17,557.74 = 5,131.08 : x
2. Step 2: Convert to fraction form
   11,709/17,557.74 = 5,131.08/x
3. Step 3: Cross multiply
   11,709x = 17,557.74 × 5,131.08
4. Step 4: Simplify right side
   11,709x = 90,090,168.56
5. Step 5: Solve for x
   x = 90,090,168.56/11,709
6. Step 6: Final answer
   x = 7,694.10