Finding the Fourth Proportional to 1,656.96, 2,286.72 and 958.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,656.96 : 2,286.72 = 958.40 : x
2. Step 2: Convert to fraction form
   1,656.96/2,286.72 = 958.40/x
3. Step 3: Cross multiply
   1,656.96x = 2,286.72 × 958.40
4. Step 4: Simplify right side
   1,656.96x = 2,191,592.45
5. Step 5: Solve for x
   x = 2,191,592.45/1,656.96
6. Step 6: Final answer
   x = 1,322.66