Finding the Fourth Proportional to 11,410.72, 17,099.34 and 5,172.64

Step by Step Solution

1. Step 1: Write the proportion equation
   11,410.72 : 17,099.34 = 5,172.64 : x
2. Step 2: Convert to fraction form
   11,410.72/17,099.34 = 5,172.64/x
3. Step 3: Cross multiply
   11,410.72x = 17,099.34 × 5,172.64
4. Step 4: Simplify right side
   11,410.72x = 88,448,730.06
5. Step 5: Solve for x
   x = 88,448,730.06/11,410.72
6. Step 6: Final answer
   x = 7,751.37