Finding the Fourth Proportional to 2,820.57, 4,222.53 and 1,777.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.57 : 4,222.53 = 1,777.38 : x
2. Step 2: Convert to fraction form
   2,820.57/4,222.53 = 1,777.38/x
3. Step 3: Cross multiply
   2,820.57x = 4,222.53 × 1,777.38
4. Step 4: Simplify right side
   2,820.57x = 7,505,040.37
5. Step 5: Solve for x
   x = 7,505,040.37/2,820.57
6. Step 6: Final answer
   x = 2,660.82