Finding the Fourth Proportional to 1,858.89, 2,782.94 and 1,398.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,858.89 : 2,782.94 = 1,398.55 : x
2. Step 2: Convert to fraction form
   1,858.89/2,782.94 = 1,398.55/x
3. Step 3: Cross multiply
   1,858.89x = 2,782.94 × 1,398.55
4. Step 4: Simplify right side
   1,858.89x = 3,892,080.74
5. Step 5: Solve for x
   x = 3,892,080.74/1,858.89
6. Step 6: Final answer
   x = 2,093.77