Finding the Fourth Proportional to 2,018.67, 3,027.78 and 631.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.67 : 3,027.78 = 631.91 : x
2. Step 2: Convert to fraction form
   2,018.67/3,027.78 = 631.91/x
3. Step 3: Cross multiply
   2,018.67x = 3,027.78 × 631.91
4. Step 4: Simplify right side
   2,018.67x = 1,913,269.32
5. Step 5: Solve for x
   x = 1,913,269.32/2,018.67
6. Step 6: Final answer
   x = 947.79