Finding the Fourth Proportional to 4,105.40, 6,156.72 and 1,639.58

Step by Step Solution

1. Step 1: Write the proportion equation
   4,105.40 : 6,156.72 = 1,639.58 : x
2. Step 2: Convert to fraction form
   4,105.40/6,156.72 = 1,639.58/x
3. Step 3: Cross multiply
   4,105.40x = 6,156.72 × 1,639.58
4. Step 4: Simplify right side
   4,105.40x = 10,094,404.19
5. Step 5: Solve for x
   x = 10,094,404.19/4,105.40
6. Step 6: Final answer
   x = 2,458.81