Finding the Fourth Proportional to 2,071.20, 2,858.31 and 1,187.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.20 : 2,858.31 = 1,187.04 : x
2. Step 2: Convert to fraction form
   2,071.20/2,858.31 = 1,187.04/x
3. Step 3: Cross multiply
   2,071.20x = 2,858.31 × 1,187.04
4. Step 4: Simplify right side
   2,071.20x = 3,392,928.30
5. Step 5: Solve for x
   x = 3,392,928.30/2,071.20
6. Step 6: Final answer
   x = 1,638.15