Finding the Fourth Proportional to 9,171.08, 12,654.59 and 5,191.35

Step by Step Solution

1. Step 1: Write the proportion equation
   9,171.08 : 12,654.59 = 5,191.35 : x
2. Step 2: Convert to fraction form
   9,171.08/12,654.59 = 5,191.35/x
3. Step 3: Cross multiply
   9,171.08x = 12,654.59 × 5,191.35
4. Step 4: Simplify right side
   9,171.08x = 65,694,405.80
5. Step 5: Solve for x
   x = 65,694,405.80/9,171.08
6. Step 6: Final answer
   x = 7,163.21