Finding the Fourth Proportional to 1,336.18, 2,003.52 and 920.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,336.18 : 2,003.52 = 920.20 : x
2. Step 2: Convert to fraction form
   1,336.18/2,003.52 = 920.20/x
3. Step 3: Cross multiply
   1,336.18x = 2,003.52 × 920.20
4. Step 4: Simplify right side
   1,336.18x = 1,843,639.10
5. Step 5: Solve for x
   x = 1,843,639.10/1,336.18
6. Step 6: Final answer
   x = 1,379.78