Finding the Fourth Proportional to 1,109.23, 1,530.43 and 689.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.23 : 1,530.43 = 689.38 : x
2. Step 2: Convert to fraction form
   1,109.23/1,530.43 = 689.38/x
3. Step 3: Cross multiply
   1,109.23x = 1,530.43 × 689.38
4. Step 4: Simplify right side
   1,109.23x = 1,055,047.83
5. Step 5: Solve for x
   x = 1,055,047.83/1,109.23
6. Step 6: Final answer
   x = 951.15