Finding the Fourth Proportional to 1,131.84, 1,698.37 and 644.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.84 : 1,698.37 = 644.96 : x
2. Step 2: Convert to fraction form
   1,131.84/1,698.37 = 644.96/x
3. Step 3: Cross multiply
   1,131.84x = 1,698.37 × 644.96
4. Step 4: Simplify right side
   1,131.84x = 1,095,383.35
5. Step 5: Solve for x
   x = 1,095,383.35/1,131.84
6. Step 6: Final answer
   x = 967.79