Finding the Fourth Proportional to 3,399.58, 5,100.81 and 1,858.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,399.58 : 5,100.81 = 1,858.78 : x
2. Step 2: Convert to fraction form
   3,399.58/5,100.81 = 1,858.78/x
3. Step 3: Cross multiply
   3,399.58x = 5,100.81 × 1,858.78
4. Step 4: Simplify right side
   3,399.58x = 9,481,283.61
5. Step 5: Solve for x
   x = 9,481,283.61/3,399.58
6. Step 6: Final answer
   x = 2,788.96