Finding the Fourth Proportional to 3,439.91, 5,160.15 and 1,100.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,439.91 : 5,160.15 = 1,100.25 : x
2. Step 2: Convert to fraction form
   3,439.91/5,160.15 = 1,100.25/x
3. Step 3: Cross multiply
   3,439.91x = 5,160.15 × 1,100.25
4. Step 4: Simplify right side
   3,439.91x = 5,677,455.04
5. Step 5: Solve for x
   x = 5,677,455.04/3,439.91
6. Step 6: Final answer
   x = 1,650.47