Finding the Fourth Proportional to 2,071.42, 2,858.52 and 1,139.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.42 : 2,858.52 = 1,139.92 : x
2. Step 2: Convert to fraction form
   2,071.42/2,858.52 = 1,139.92/x
3. Step 3: Cross multiply
   2,071.42x = 2,858.52 × 1,139.92
4. Step 4: Simplify right side
   2,071.42x = 3,258,484.12
5. Step 5: Solve for x
   x = 3,258,484.12/2,071.42
6. Step 6: Final answer
   x = 1,573.07