Finding the Fourth Proportional to 2,071.08, 2,858.22 and 1,139.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.08 : 2,858.22 = 1,139.58 : x
2. Step 2: Convert to fraction form
   2,071.08/2,858.22 = 1,139.58/x
3. Step 3: Cross multiply
   2,071.08x = 2,858.22 × 1,139.58
4. Step 4: Simplify right side
   2,071.08x = 3,257,170.35
5. Step 5: Solve for x
   x = 3,257,170.35/2,071.08
6. Step 6: Final answer
   x = 1,572.69