Finding the Fourth Proportional to 1,868.06, 2,577.98 and 1,028.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,868.06 : 2,577.98 = 1,028.80 : x
2. Step 2: Convert to fraction form
   1,868.06/2,577.98 = 1,028.80/x
3. Step 3: Cross multiply
   1,868.06x = 2,577.98 × 1,028.80
4. Step 4: Simplify right side
   1,868.06x = 2,652,225.82
5. Step 5: Solve for x
   x = 2,652,225.82/1,868.06
6. Step 6: Final answer
   x = 1,419.78