Finding the Fourth Proportional to 1,858.03, 2,784.61 and 1,392.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,858.03 : 2,784.61 = 1,392.15 : x
2. Step 2: Convert to fraction form
   1,858.03/2,784.61 = 1,392.15/x
3. Step 3: Cross multiply
   1,858.03x = 2,784.61 × 1,392.15
4. Step 4: Simplify right side
   1,858.03x = 3,876,594.81
5. Step 5: Solve for x
   x = 3,876,594.81/1,858.03
6. Step 6: Final answer
   x = 2,086.40