Finding the Fourth Proportional to 2,651.44, 3,978.98 and 920.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,651.44 : 3,978.98 = 920.06 : x
2. Step 2: Convert to fraction form
   2,651.44/3,978.98 = 920.06/x
3. Step 3: Cross multiply
   2,651.44x = 3,978.98 × 920.06
4. Step 4: Simplify right side
   2,651.44x = 3,660,912.59
5. Step 5: Solve for x
   x = 3,660,912.59/2,651.44
6. Step 6: Final answer
   x = 1,380.73