Finding the Fourth Proportional to 1,868.27, 2,578.64 and 1,071.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,868.27 : 2,578.64 = 1,071.43 : x
2. Step 2: Convert to fraction form
   1,868.27/2,578.64 = 1,071.43/x
3. Step 3: Cross multiply
   1,868.27x = 2,578.64 × 1,071.43
4. Step 4: Simplify right side
   1,868.27x = 2,762,820.45
5. Step 5: Solve for x
   x = 2,762,820.45/1,868.27
6. Step 6: Final answer
   x = 1,478.82