Finding the Fourth Proportional to 1,621.76, 2,238.12 and 958.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,621.76 : 2,238.12 = 958.16 : x
2. Step 2: Convert to fraction form
   1,621.76/2,238.12 = 958.16/x
3. Step 3: Cross multiply
   1,621.76x = 2,238.12 × 958.16
4. Step 4: Simplify right side
   1,621.76x = 2,144,477.06
5. Step 5: Solve for x
   x = 2,144,477.06/1,621.76
6. Step 6: Final answer
   x = 1,322.31