Finding the Fourth Proportional to 8,689.24, 13,051.34 and 5,186.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,689.24 : 13,051.34 = 5,186.10 : x
2. Step 2: Convert to fraction form
   8,689.24/13,051.34 = 5,186.10/x
3. Step 3: Cross multiply
   8,689.24x = 13,051.34 × 5,186.10
4. Step 4: Simplify right side
   8,689.24x = 67,685,554.37
5. Step 5: Solve for x
   x = 67,685,554.37/8,689.24
6. Step 6: Final answer
   x = 7,789.58