Finding the Fourth Proportional to 2,018.94, 3,030.57 and 1,638.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.94 : 3,030.57 = 1,638.78 : x
2. Step 2: Convert to fraction form
   2,018.94/3,030.57 = 1,638.78/x
3. Step 3: Cross multiply
   2,018.94x = 3,030.57 × 1,638.78
4. Step 4: Simplify right side
   2,018.94x = 4,966,437.50
5. Step 5: Solve for x
   x = 4,966,437.50/2,018.94
6. Step 6: Final answer
   x = 2,459.92