Finding the Fourth Proportional to 9,170.67, 12,655.83 and 5,191.71

Step by Step Solution

1. Step 1: Write the proportion equation
   9,170.67 : 12,655.83 = 5,191.71 : x
2. Step 2: Convert to fraction form
   9,170.67/12,655.83 = 5,191.71/x
3. Step 3: Cross multiply
   9,170.67x = 12,655.83 × 5,191.71
4. Step 4: Simplify right side
   9,170.67x = 65,705,399.17
5. Step 5: Solve for x
   x = 65,705,399.17/9,170.67
6. Step 6: Final answer
   x = 7,164.73