Finding the Fourth Proportional to 8,555.10, 11,799.72 and 5,408.25

Step by Step Solution

1. Step 1: Write the proportion equation
   8,555.10 : 11,799.72 = 5,408.25 : x
2. Step 2: Convert to fraction form
   8,555.10/11,799.72 = 5,408.25/x
3. Step 3: Cross multiply
   8,555.10x = 11,799.72 × 5,408.25
4. Step 4: Simplify right side
   8,555.10x = 63,815,835.69
5. Step 5: Solve for x
   x = 63,815,835.69/8,555.10
6. Step 6: Final answer
   x = 7,459.39