Finding the Fourth Proportional to 9,216.89, 13,758.05 and 7,909.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,216.89 : 13,758.05 = 7,909.05 : x
2. Step 2: Convert to fraction form
   9,216.89/13,758.05 = 7,909.05/x
3. Step 3: Cross multiply
   9,216.89x = 13,758.05 × 7,909.05
4. Step 4: Simplify right side
   9,216.89x = 108,813,106.64
5. Step 5: Solve for x
   x = 108,813,106.64/9,216.89
6. Step 6: Final answer
   x = 11,805.83