Finding the Fourth Proportional to 1,396.78, 1,928.84 and 900.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.78 : 1,928.84 = 900.27 : x
2. Step 2: Convert to fraction form
   1,396.78/1,928.84 = 900.27/x
3. Step 3: Cross multiply
   1,396.78x = 1,928.84 × 900.27
4. Step 4: Simplify right side
   1,396.78x = 1,736,483.86
5. Step 5: Solve for x
   x = 1,736,483.86/1,396.78
6. Step 6: Final answer
   x = 1,243.20