Finding the Fourth Proportional to 1,191.60, 1,644.52 and 694.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.60 : 1,644.52 = 694.20 : x
2. Step 2: Convert to fraction form
   1,191.60/1,644.52 = 694.20/x
3. Step 3: Cross multiply
   1,191.60x = 1,644.52 × 694.20
4. Step 4: Simplify right side
   1,191.60x = 1,141,625.78
5. Step 5: Solve for x
   x = 1,141,625.78/1,191.60
6. Step 6: Final answer
   x = 958.06