Finding the Fourth Proportional to 16,860.96, 25,294.32 and 5,172.96

Step by Step Solution

1. Step 1: Write the proportion equation
   16,860.96 : 25,294.32 = 5,172.96 : x
2. Step 2: Convert to fraction form
   16,860.96/25,294.32 = 5,172.96/x
3. Step 3: Cross multiply
   16,860.96x = 25,294.32 × 5,172.96
4. Step 4: Simplify right side
   16,860.96x = 130,846,505.59
5. Step 5: Solve for x
   x = 130,846,505.59/16,860.96
6. Step 6: Final answer
   x = 7,760.32