Finding the Fourth Proportional to 1,443.61, 1,992.36 and 920.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.61 : 1,992.36 = 920.35 : x
2. Step 2: Convert to fraction form
   1,443.61/1,992.36 = 920.35/x
3. Step 3: Cross multiply
   1,443.61x = 1,992.36 × 920.35
4. Step 4: Simplify right side
   1,443.61x = 1,833,668.53
5. Step 5: Solve for x
   x = 1,833,668.53/1,443.61
6. Step 6: Final answer
   x = 1,270.20