Finding the Fourth Proportional to 11,715.51, 17,561.02 and 5,136.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,715.51 : 17,561.02 = 5,136.15 : x
2. Step 2: Convert to fraction form
   11,715.51/17,561.02 = 5,136.15/x
3. Step 3: Cross multiply
   11,715.51x = 17,561.02 × 5,136.15
4. Step 4: Simplify right side
   11,715.51x = 90,196,032.87
5. Step 5: Solve for x
   x = 90,196,032.87/11,715.51
6. Step 6: Final answer
   x = 7,698.86