Finding the Fourth Proportional to 1,870.52, 2,578.91 and 1,280.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.52 : 2,578.91 = 1,280.03 : x
2. Step 2: Convert to fraction form
   1,870.52/2,578.91 = 1,280.03/x
3. Step 3: Cross multiply
   1,870.52x = 2,578.91 × 1,280.03
4. Step 4: Simplify right side
   1,870.52x = 3,301,062.87
5. Step 5: Solve for x
   x = 3,301,062.87/1,870.52
6. Step 6: Final answer
   x = 1,764.79