Finding the Fourth Proportional to 1,607.78, 2,218.37 and 1,018.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,607.78 : 2,218.37 = 1,018.10 : x
2. Step 2: Convert to fraction form
   1,607.78/2,218.37 = 1,018.10/x
3. Step 3: Cross multiply
   1,607.78x = 2,218.37 × 1,018.10
4. Step 4: Simplify right side
   1,607.78x = 2,258,506.31
5. Step 5: Solve for x
   x = 2,258,506.31/1,607.78
6. Step 6: Final answer
   x = 1,404.74