Finding the Fourth Proportional to 2,074.68, 3,112.56 and 920.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.68 : 3,112.56 = 920.16 : x
2. Step 2: Convert to fraction form
   2,074.68/3,112.56 = 920.16/x
3. Step 3: Cross multiply
   2,074.68x = 3,112.56 × 920.16
4. Step 4: Simplify right side
   2,074.68x = 2,864,053.21
5. Step 5: Solve for x
   x = 2,864,053.21/2,074.68
6. Step 6: Final answer
   x = 1,380.48