Finding the Fourth Proportional to 9,105.72, 13,660.66 and 3,913.08

Step by Step Solution

1. Step 1: Write the proportion equation
   9,105.72 : 13,660.66 = 3,913.08 : x
2. Step 2: Convert to fraction form
   9,105.72/13,660.66 = 3,913.08/x
3. Step 3: Cross multiply
   9,105.72x = 13,660.66 × 3,913.08
4. Step 4: Simplify right side
   9,105.72x = 53,455,255.43
5. Step 5: Solve for x
   x = 53,455,255.43/9,105.72
6. Step 6: Final answer
   x = 5,870.51