Finding the Fourth Proportional to 8,991.68, 12,406.41 and 5,454.80

Step by Step Solution

1. Step 1: Write the proportion equation
   8,991.68 : 12,406.41 = 5,454.80 : x
2. Step 2: Convert to fraction form
   8,991.68/12,406.41 = 5,454.80/x
3. Step 3: Cross multiply
   8,991.68x = 12,406.41 × 5,454.80
4. Step 4: Simplify right side
   8,991.68x = 67,674,485.27
5. Step 5: Solve for x
   x = 67,674,485.27/8,991.68
6. Step 6: Final answer
   x = 7,526.34