Finding the Fourth Proportional to 3,340.47, 5,005.20 and 1,147.99

Step by Step Solution

1. Step 1: Write the proportion equation
   3,340.47 : 5,005.20 = 1,147.99 : x
2. Step 2: Convert to fraction form
   3,340.47/5,005.20 = 1,147.99/x
3. Step 3: Cross multiply
   3,340.47x = 5,005.20 × 1,147.99
4. Step 4: Simplify right side
   3,340.47x = 5,745,919.55
5. Step 5: Solve for x
   x = 5,745,919.55/3,340.47
6. Step 6: Final answer
   x = 1,720.09