Finding the Fourth Proportional to 2,071.26, 2,858.22 and 1,139.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.26 : 2,858.22 = 1,139.76 : x
2. Step 2: Convert to fraction form
   2,071.26/2,858.22 = 1,139.76/x
3. Step 3: Cross multiply
   2,071.26x = 2,858.22 × 1,139.76
4. Step 4: Simplify right side
   2,071.26x = 3,257,684.83
5. Step 5: Solve for x
   x = 3,257,684.83/2,071.26
6. Step 6: Final answer
   x = 1,572.80