Finding the Fourth Proportional to 9,967.50, 13,755.78 and 5,491.26

Step by Step Solution

1. Step 1: Write the proportion equation
   9,967.50 : 13,755.78 = 5,491.26 : x
2. Step 2: Convert to fraction form
   9,967.50/13,755.78 = 5,491.26/x
3. Step 3: Cross multiply
   9,967.50x = 13,755.78 × 5,491.26
4. Step 4: Simplify right side
   9,967.50x = 75,536,468.25
5. Step 5: Solve for x
   x = 75,536,468.25/9,967.50
6. Step 6: Final answer
   x = 7,578.28