Finding the Fourth Proportional to 9,357.91, 12,913.89 and 5,166.13

Step by Step Solution

1. Step 1: Write the proportion equation
   9,357.91 : 12,913.89 = 5,166.13 : x
2. Step 2: Convert to fraction form
   9,357.91/12,913.89 = 5,166.13/x
3. Step 3: Cross multiply
   9,357.91x = 12,913.89 × 5,166.13
4. Step 4: Simplify right side
   9,357.91x = 66,714,808.72
5. Step 5: Solve for x
   x = 66,714,808.72/9,357.91
6. Step 6: Final answer
   x = 7,129.24