Finding the Fourth Proportional to 1,858.77, 2,785.59 and 1,078.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,858.77 : 2,785.59 = 1,078.29 : x
2. Step 2: Convert to fraction form
   1,858.77/2,785.59 = 1,078.29/x
3. Step 3: Cross multiply
   1,858.77x = 2,785.59 × 1,078.29
4. Step 4: Simplify right side
   1,858.77x = 3,003,673.84
5. Step 5: Solve for x
   x = 3,003,673.84/1,858.77
6. Step 6: Final answer
   x = 1,615.95