Finding the Fourth Proportional to 1,443.52, 1,991.84 and 920

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.52 : 1,991.84 = 920 : x
2. Step 2: Convert to fraction form
   1,443.52/1,991.84 = 920/x
3. Step 3: Cross multiply
   1,443.52x = 1,991.84 × 920
4. Step 4: Simplify right side
   1,443.52x = 1,832,492.80
5. Step 5: Solve for x
   x = 1,832,492.80/1,443.52
6. Step 6: Final answer
   x = 1,269.46