Finding the Fourth Proportional to 2,665.89, 3,679.56 and 1,781.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.89 : 3,679.56 = 1,781.37 : x
2. Step 2: Convert to fraction form
   2,665.89/3,679.56 = 1,781.37/x
3. Step 3: Cross multiply
   2,665.89x = 3,679.56 × 1,781.37
4. Step 4: Simplify right side
   2,665.89x = 6,554,657.80
5. Step 5: Solve for x
   x = 6,554,657.80/2,665.89
6. Step 6: Final answer
   x = 2,458.71