Finding the Fourth Proportional to 1,550.89, 2,139.26 and 1,019.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.89 : 2,139.26 = 1,019.80 : x
2. Step 2: Convert to fraction form
   1,550.89/2,139.26 = 1,019.80/x
3. Step 3: Cross multiply
   1,550.89x = 2,139.26 × 1,019.80
4. Step 4: Simplify right side
   1,550.89x = 2,181,617.35
5. Step 5: Solve for x
   x = 2,181,617.35/1,550.89
6. Step 6: Final answer
   x = 1,406.69