Finding the Fourth Proportional to 1,900.17, 2,851.40 and 668.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,900.17 : 2,851.40 = 668.50 : x
2. Step 2: Convert to fraction form
   1,900.17/2,851.40 = 668.50/x
3. Step 3: Cross multiply
   1,900.17x = 2,851.40 × 668.50
4. Step 4: Simplify right side
   1,900.17x = 1,906,155.44
5. Step 5: Solve for x
   x = 1,906,155.44/1,900.17
6. Step 6: Final answer
   x = 1,003.15