Finding the Fourth Proportional to 2,076.10, 3,105.15 and 1,858.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,076.10 : 3,105.15 = 1,858.30 : x
2. Step 2: Convert to fraction form
   2,076.10/3,105.15 = 1,858.30/x
3. Step 3: Cross multiply
   2,076.10x = 3,105.15 × 1,858.30
4. Step 4: Simplify right side
   2,076.10x = 5,770,300.25
5. Step 5: Solve for x
   x = 5,770,300.25/2,076.10
6. Step 6: Final answer
   x = 2,779.39