Finding the Fourth Proportional to 1,109.30, 1,530.63 and 689.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.30 : 1,530.63 = 689.31 : x
2. Step 2: Convert to fraction form
   1,109.30/1,530.63 = 689.31/x
3. Step 3: Cross multiply
   1,109.30x = 1,530.63 × 689.31
4. Step 4: Simplify right side
   1,109.30x = 1,055,078.57
5. Step 5: Solve for x
   x = 1,055,078.57/1,109.30
6. Step 6: Final answer
   x = 951.13