Finding the Fourth Proportional to 9,175.78, 12,662.53 and 5,196.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,175.78 : 12,662.53 = 5,196.79 : x
2. Step 2: Convert to fraction form
   9,175.78/12,662.53 = 5,196.79/x
3. Step 3: Cross multiply
   9,175.78x = 12,662.53 × 5,196.79
4. Step 4: Simplify right side
   9,175.78x = 65,804,509.28
5. Step 5: Solve for x
   x = 65,804,509.28/9,175.78
6. Step 6: Final answer
   x = 7,171.54