Finding the Fourth Proportional to 2,113.80, 3,171.98 and 959.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.80 : 3,171.98 = 959.56 : x
2. Step 2: Convert to fraction form
   2,113.80/3,171.98 = 959.56/x
3. Step 3: Cross multiply
   2,113.80x = 3,171.98 × 959.56
4. Step 4: Simplify right side
   2,113.80x = 3,043,705.13
5. Step 5: Solve for x
   x = 3,043,705.13/2,113.80
6. Step 6: Final answer
   x = 1,439.92