Finding the Fourth Proportional to 1,767.89, 2,638.94 and 1,639.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,767.89 : 2,638.94 = 1,639.42 : x
2. Step 2: Convert to fraction form
   1,767.89/2,638.94 = 1,639.42/x
3. Step 3: Cross multiply
   1,767.89x = 2,638.94 × 1,639.42
4. Step 4: Simplify right side
   1,767.89x = 4,326,316.22
5. Step 5: Solve for x
   x = 4,326,316.22/1,767.89
6. Step 6: Final answer
   x = 2,447.16