Finding the Fourth Proportional to 1,191.96, 1,644.78 and 694.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.96 : 1,644.78 = 694.55 : x
2. Step 2: Convert to fraction form
   1,191.96/1,644.78 = 694.55/x
3. Step 3: Cross multiply
   1,191.96x = 1,644.78 × 694.55
4. Step 4: Simplify right side
   1,191.96x = 1,142,386.06
5. Step 5: Solve for x
   x = 1,142,386.06/1,191.96
6. Step 6: Final answer
   x = 958.41