Finding the Fourth Proportional to 2,074.64, 3,111.78 and 979.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.64 : 3,111.78 = 979.28 : x
2. Step 2: Convert to fraction form
   2,074.64/3,111.78 = 979.28/x
3. Step 3: Cross multiply
   2,074.64x = 3,111.78 × 979.28
4. Step 4: Simplify right side
   2,074.64x = 3,047,303.92
5. Step 5: Solve for x
   x = 3,047,303.92/2,074.64
6. Step 6: Final answer
   x = 1,468.84