Finding the Fourth Proportional to 2,800.80, 3,865.37 and 1,542.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,800.80 : 3,865.37 = 1,542.09 : x
2. Step 2: Convert to fraction form
   2,800.80/3,865.37 = 1,542.09/x
3. Step 3: Cross multiply
   2,800.80x = 3,865.37 × 1,542.09
4. Step 4: Simplify right side
   2,800.80x = 5,960,740.71
5. Step 5: Solve for x
   x = 5,960,740.71/2,800.80
6. Step 6: Final answer
   x = 2,128.23