Finding the Fourth Proportional to 2,801.89, 3,866.86 and 1,543.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,801.89 : 3,866.86 = 1,543.20 : x
2. Step 2: Convert to fraction form
   2,801.89/3,866.86 = 1,543.20/x
3. Step 3: Cross multiply
   2,801.89x = 3,866.86 × 1,543.20
4. Step 4: Simplify right side
   2,801.89x = 5,967,351.87
5. Step 5: Solve for x
   x = 5,967,351.87/2,801.89
6. Step 6: Final answer
   x = 2,129.76