Finding the Fourth Proportional to 11,458.63, 17,186.42 and 5,211.91

Step by Step Solution

1. Step 1: Write the proportion equation
   11,458.63 : 17,186.42 = 5,211.91 : x
2. Step 2: Convert to fraction form
   11,458.63/17,186.42 = 5,211.91/x
3. Step 3: Cross multiply
   11,458.63x = 17,186.42 × 5,211.91
4. Step 4: Simplify right side
   11,458.63x = 89,574,044.33
5. Step 5: Solve for x
   x = 89,574,044.33/11,458.63
6. Step 6: Final answer
   x = 7,817.17