Finding the Fourth Proportional to 1,919.09, 2,877.72 and 1,040.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,919.09 : 2,877.72 = 1,040.20 : x
2. Step 2: Convert to fraction form
   1,919.09/2,877.72 = 1,040.20/x
3. Step 3: Cross multiply
   1,919.09x = 2,877.72 × 1,040.20
4. Step 4: Simplify right side
   1,919.09x = 2,993,404.34
5. Step 5: Solve for x
   x = 2,993,404.34/1,919.09
6. Step 6: Final answer
   x = 1,559.80