Finding the Fourth Proportional to 1,870.92, 2,578.93 and 1,280.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.92 : 2,578.93 = 1,280.43 : x
2. Step 2: Convert to fraction form
   1,870.92/2,578.93 = 1,280.43/x
3. Step 3: Cross multiply
   1,870.92x = 2,578.93 × 1,280.43
4. Step 4: Simplify right side
   1,870.92x = 3,302,139.34
5. Step 5: Solve for x
   x = 3,302,139.34/1,870.92
6. Step 6: Final answer
   x = 1,764.98