Finding the Fourth Proportional to 1,399.20, 2,094.72 and 910.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.20 : 2,094.72 = 910.56 : x
2. Step 2: Convert to fraction form
   1,399.20/2,094.72 = 910.56/x
3. Step 3: Cross multiply
   1,399.20x = 2,094.72 × 910.56
4. Step 4: Simplify right side
   1,399.20x = 1,907,368.24
5. Step 5: Solve for x
   x = 1,907,368.24/1,399.20
6. Step 6: Final answer
   x = 1,363.18