Finding the Fourth Proportional to 3,815.21, 5,225.54 and 3,591.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,815.21 : 5,225.54 = 3,591.05 : x
2. Step 2: Convert to fraction form
   3,815.21/5,225.54 = 3,591.05/x
3. Step 3: Cross multiply
   3,815.21x = 5,225.54 × 3,591.05
4. Step 4: Simplify right side
   3,815.21x = 18,765,131.33
5. Step 5: Solve for x
   x = 18,765,131.33/3,815.21
6. Step 6: Final answer
   x = 4,918.51