Finding the Fourth Proportional to 1,801.78, 2,700.37 and 813.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,801.78 : 2,700.37 = 813.54 : x
2. Step 2: Convert to fraction form
   1,801.78/2,700.37 = 813.54/x
3. Step 3: Cross multiply
   1,801.78x = 2,700.37 × 813.54
4. Step 4: Simplify right side
   1,801.78x = 2,196,859.01
5. Step 5: Solve for x
   x = 2,196,859.01/1,801.78
6. Step 6: Final answer
   x = 1,219.27