Finding the Fourth Proportional to 2,816.98, 3,887.60 and 2,020.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,816.98 : 3,887.60 = 2,020.55 : x
2. Step 2: Convert to fraction form
   2,816.98/3,887.60 = 2,020.55/x
3. Step 3: Cross multiply
   2,816.98x = 3,887.60 × 2,020.55
4. Step 4: Simplify right side
   2,816.98x = 7,855,075.79
5. Step 5: Solve for x
   x = 7,855,075.79/2,816.98
6. Step 6: Final answer
   x = 2,788.48