Finding the Fourth Proportional to 2,054.40, 3,065.78 and 1,641.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,054.40 : 3,065.78 = 1,641.60 : x
2. Step 2: Convert to fraction form
   2,054.40/3,065.78 = 1,641.60/x
3. Step 3: Cross multiply
   2,054.40x = 3,065.78 × 1,641.60
4. Step 4: Simplify right side
   2,054.40x = 5,032,784.45
5. Step 5: Solve for x
   x = 5,032,784.45/2,054.40
6. Step 6: Final answer
   x = 2,449.76