Finding the Fourth Proportional to 1,919.60, 2,647.76 and 1,550.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,919.60 : 2,647.76 = 1,550.55 : x
2. Step 2: Convert to fraction form
   1,919.60/2,647.76 = 1,550.55/x
3. Step 3: Cross multiply
   1,919.60x = 2,647.76 × 1,550.55
4. Step 4: Simplify right side
   1,919.60x = 4,105,476.52
5. Step 5: Solve for x
   x = 4,105,476.52/1,919.60
6. Step 6: Final answer
   x = 2,138.72