Finding the Fourth Proportional to 2,071.62, 2,858.61 and 1,139.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.62 : 2,858.61 = 1,139.94 : x
2. Step 2: Convert to fraction form
   2,071.62/2,858.61 = 1,139.94/x
3. Step 3: Cross multiply
   2,071.62x = 2,858.61 × 1,139.94
4. Step 4: Simplify right side
   2,071.62x = 3,258,643.88
5. Step 5: Solve for x
   x = 3,258,643.88/2,071.62
6. Step 6: Final answer
   x = 1,572.99