Finding the Fourth Proportional to 2,611.10, 3,918.85 and 1,377.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.10 : 3,918.85 = 1,377.87 : x
2. Step 2: Convert to fraction form
   2,611.10/3,918.85 = 1,377.87/x
3. Step 3: Cross multiply
   2,611.10x = 3,918.85 × 1,377.87
4. Step 4: Simplify right side
   2,611.10x = 5,399,662.40
5. Step 5: Solve for x
   x = 5,399,662.40/2,611.10
6. Step 6: Final answer
   x = 2,067.97