Finding the Fourth Proportional to 3,626.91, 5,443.20 and 1,985.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,626.91 : 5,443.20 = 1,985.31 : x
2. Step 2: Convert to fraction form
   3,626.91/5,443.20 = 1,985.31/x
3. Step 3: Cross multiply
   3,626.91x = 5,443.20 × 1,985.31
4. Step 4: Simplify right side
   3,626.91x = 10,806,439.39
5. Step 5: Solve for x
   x = 10,806,439.39/3,626.91
6. Step 6: Final answer
   x = 2,979.52