Finding the Fourth Proportional to 2,854.51, 3,939.89 and 1,858.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,854.51 : 3,939.89 = 1,858.06 : x
2. Step 2: Convert to fraction form
   2,854.51/3,939.89 = 1,858.06/x
3. Step 3: Cross multiply
   2,854.51x = 3,939.89 × 1,858.06
4. Step 4: Simplify right side
   2,854.51x = 7,320,552.01
5. Step 5: Solve for x
   x = 7,320,552.01/2,854.51
6. Step 6: Final answer
   x = 2,564.56