Finding the Fourth Proportional to 12,963.66, 19,442.61 and 5,170.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,963.66 : 19,442.61 = 5,170.38 : x
2. Step 2: Convert to fraction form
   12,963.66/19,442.61 = 5,170.38/x
3. Step 3: Cross multiply
   12,963.66x = 19,442.61 × 5,170.38
4. Step 4: Simplify right side
   12,963.66x = 100,525,681.89
5. Step 5: Solve for x
   x = 100,525,681.89/12,963.66
6. Step 6: Final answer
   x = 7,754.42