Finding the Fourth Proportional to 2,443.80, 3,664.35 and 981.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,443.80 : 3,664.35 = 981.30 : x
2. Step 2: Convert to fraction form
   2,443.80/3,664.35 = 981.30/x
3. Step 3: Cross multiply
   2,443.80x = 3,664.35 × 981.30
4. Step 4: Simplify right side
   2,443.80x = 3,595,826.66
5. Step 5: Solve for x
   x = 3,595,826.66/2,443.80
6. Step 6: Final answer
   x = 1,471.41