Finding the Fourth Proportional to 9,969.31, 13,757.36 and 5,431.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,969.31 : 13,757.36 = 5,431.89 : x
2. Step 2: Convert to fraction form
   9,969.31/13,757.36 = 5,431.89/x
3. Step 3: Cross multiply
   9,969.31x = 13,757.36 × 5,431.89
4. Step 4: Simplify right side
   9,969.31x = 74,728,521.20
5. Step 5: Solve for x
   x = 74,728,521.20/9,969.31
6. Step 6: Final answer
   x = 7,495.86