Finding the Fourth Proportional to 3,870.81, 5,805.33 and 1,789.68

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.81 : 5,805.33 = 1,789.68 : x
2. Step 2: Convert to fraction form
   3,870.81/5,805.33 = 1,789.68/x
3. Step 3: Cross multiply
   3,870.81x = 5,805.33 × 1,789.68
4. Step 4: Simplify right side
   3,870.81x = 10,389,665.74
5. Step 5: Solve for x
   x = 10,389,665.74/3,870.81
6. Step 6: Final answer
   x = 2,684.11