Finding the Fourth Proportional to 1,868.56, 2,578.49 and 1,071.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,868.56 : 2,578.49 = 1,071.71 : x
2. Step 2: Convert to fraction form
   1,868.56/2,578.49 = 1,071.71/x
3. Step 3: Cross multiply
   1,868.56x = 2,578.49 × 1,071.71
4. Step 4: Simplify right side
   1,868.56x = 2,763,388.96
5. Step 5: Solve for x
   x = 2,763,388.96/1,868.56
6. Step 6: Final answer
   x = 1,478.89