Finding the Fourth Proportional to 9,005.76, 13,509.99 and 3,161.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,005.76 : 13,509.99 = 3,161.34 : x
2. Step 2: Convert to fraction form
   9,005.76/13,509.99 = 3,161.34/x
3. Step 3: Cross multiply
   9,005.76x = 13,509.99 × 3,161.34
4. Step 4: Simplify right side
   9,005.76x = 42,709,671.79
5. Step 5: Solve for x
   x = 42,709,671.79/9,005.76
6. Step 6: Final answer
   x = 4,742.48