Finding the Fourth Proportional to 11,434.72, 17,143.87 and 5,191.60

Step by Step Solution

1. Step 1: Write the proportion equation
   11,434.72 : 17,143.87 = 5,191.60 : x
2. Step 2: Convert to fraction form
   11,434.72/17,143.87 = 5,191.60/x
3. Step 3: Cross multiply
   11,434.72x = 17,143.87 × 5,191.60
4. Step 4: Simplify right side
   11,434.72x = 89,004,115.49
5. Step 5: Solve for x
   x = 89,004,115.49/11,434.72
6. Step 6: Final answer
   x = 7,783.67