Finding the Fourth Proportional to 3,118.78, 4,678.98 and 1,171

Step by Step Solution

1. Step 1: Write the proportion equation
   3,118.78 : 4,678.98 = 1,171 : x
2. Step 2: Convert to fraction form
   3,118.78/4,678.98 = 1,171/x
3. Step 3: Cross multiply
   3,118.78x = 4,678.98 × 1,171
4. Step 4: Simplify right side
   3,118.78x = 5,479,085.58
5. Step 5: Solve for x
   x = 5,479,085.58/3,118.78
6. Step 6: Final answer
   x = 1,756.80