Finding the Fourth Proportional to 1,656.42, 2,285.76 and 957.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,656.42 : 2,285.76 = 957.78 : x
2. Step 2: Convert to fraction form
   1,656.42/2,285.76 = 957.78/x
3. Step 3: Cross multiply
   1,656.42x = 2,285.76 × 957.78
4. Step 4: Simplify right side
   1,656.42x = 2,189,255.21
5. Step 5: Solve for x
   x = 2,189,255.21/1,656.42
6. Step 6: Final answer
   x = 1,321.68