Finding the Fourth Proportional to 1,189.04, 1,782.42 and 641.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189.04 : 1,782.42 = 641.27 : x
2. Step 2: Convert to fraction form
   1,189.04/1,782.42 = 641.27/x
3. Step 3: Cross multiply
   1,189.04x = 1,782.42 × 641.27
4. Step 4: Simplify right side
   1,189.04x = 1,143,003.56
5. Step 5: Solve for x
   x = 1,143,003.56/1,189.04
6. Step 6: Final answer
   x = 961.29