Finding the Fourth Proportional to 9,967.91, 13,755.65 and 5,491.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,967.91 : 13,755.65 = 5,491.55 : x
2. Step 2: Convert to fraction form
   9,967.91/13,755.65 = 5,491.55/x
3. Step 3: Cross multiply
   9,967.91x = 13,755.65 × 5,491.55
4. Step 4: Simplify right side
   9,967.91x = 75,539,846.69
5. Step 5: Solve for x
   x = 75,539,846.69/9,967.91
6. Step 6: Final answer
   x = 7,578.31