Finding the Fourth Proportional to 9,142.31, 13,718.42 and 3,880.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,142.31 : 13,718.42 = 3,880.28 : x
2. Step 2: Convert to fraction form
   9,142.31/13,718.42 = 3,880.28/x
3. Step 3: Cross multiply
   9,142.31x = 13,718.42 × 3,880.28
4. Step 4: Simplify right side
   9,142.31x = 53,231,237.32
5. Step 5: Solve for x
   x = 53,231,237.32/9,142.31
6. Step 6: Final answer
   x = 5,822.52