Finding the Fourth Proportional to 1,621.98, 2,238.21 and 958.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,621.98 : 2,238.21 = 958.71 : x
2. Step 2: Convert to fraction form
   1,621.98/2,238.21 = 958.71/x
3. Step 3: Cross multiply
   1,621.98x = 2,238.21 × 958.71
4. Step 4: Simplify right side
   1,621.98x = 2,145,794.31
5. Step 5: Solve for x
   x = 2,145,794.31/1,621.98
6. Step 6: Final answer
   x = 1,322.95