Finding the Fourth Proportional to 17,401.76, 26,099.64 and 5,715.20

Step by Step Solution

1. Step 1: Write the proportion equation
   17,401.76 : 26,099.64 = 5,715.20 : x
2. Step 2: Convert to fraction form
   17,401.76/26,099.64 = 5,715.20/x
3. Step 3: Cross multiply
   17,401.76x = 26,099.64 × 5,715.20
4. Step 4: Simplify right side
   17,401.76x = 149,164,662.53
5. Step 5: Solve for x
   x = 149,164,662.53/17,401.76
6. Step 6: Final answer
   x = 8,571.81