Finding the Fourth Proportional to 2,978.32, 4,106.28 and 2,191

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.32 : 4,106.28 = 2,191 : x
2. Step 2: Convert to fraction form
   2,978.32/4,106.28 = 2,191/x
3. Step 3: Cross multiply
   2,978.32x = 4,106.28 × 2,191
4. Step 4: Simplify right side
   2,978.32x = 8,996,859.48
5. Step 5: Solve for x
   x = 8,996,859.48/2,978.32
6. Step 6: Final answer
   x = 3,020.78