Finding the Fourth Proportional to 2,071.34, 2,858.28 and 1,139.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.34 : 2,858.28 = 1,139.84 : x
2. Step 2: Convert to fraction form
   2,071.34/2,858.28 = 1,139.84/x
3. Step 3: Cross multiply
   2,071.34x = 2,858.28 × 1,139.84
4. Step 4: Simplify right side
   2,071.34x = 3,257,981.88
5. Step 5: Solve for x
   x = 3,257,981.88/2,071.34
6. Step 6: Final answer
   x = 1,572.89