Finding the Fourth Proportional to 11,691.51, 17,429 and 11,511.69

Step by Step Solution

1. Step 1: Write the proportion equation
   11,691.51 : 17,429 = 11,511.69 : x
2. Step 2: Convert to fraction form
   11,691.51/17,429 = 11,511.69/x
3. Step 3: Cross multiply
   11,691.51x = 17,429 × 11,511.69
4. Step 4: Simplify right side
   11,691.51x = 200,637,245.01
5. Step 5: Solve for x
   x = 200,637,245.01/11,691.51
6. Step 6: Final answer
   x = 17,160.94