Finding the Fourth Proportional to 2,550.84, 3,520.23 and 1,555.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,550.84 : 3,520.23 = 1,555.89 : x
2. Step 2: Convert to fraction form
   2,550.84/3,520.23 = 1,555.89/x
3. Step 3: Cross multiply
   2,550.84x = 3,520.23 × 1,555.89
4. Step 4: Simplify right side
   2,550.84x = 5,477,090.65
5. Step 5: Solve for x
   x = 5,477,090.65/2,550.84
6. Step 6: Final answer
   x = 2,147.17