Finding the Fourth Proportional to 2,638.07, 3,958.46 and 1,178.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.07 : 3,958.46 = 1,178.18 : x
2. Step 2: Convert to fraction form
   2,638.07/3,958.46 = 1,178.18/x
3. Step 3: Cross multiply
   2,638.07x = 3,958.46 × 1,178.18
4. Step 4: Simplify right side
   2,638.07x = 4,663,778.40
5. Step 5: Solve for x
   x = 4,663,778.40/2,638.07
6. Step 6: Final answer
   x = 1,767.88