Finding the Fourth Proportional to 1,641.94, 2,461.83 and 667.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.94 : 2,461.83 = 667.78 : x
2. Step 2: Convert to fraction form
   1,641.94/2,461.83 = 667.78/x
3. Step 3: Cross multiply
   1,641.94x = 2,461.83 × 667.78
4. Step 4: Simplify right side
   1,641.94x = 1,643,960.84
5. Step 5: Solve for x
   x = 1,643,960.84/1,641.94
6. Step 6: Final answer
   x = 1,001.23