Finding the Fourth Proportional to 1,109.08, 1,530.52 and 689.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.08 : 1,530.52 = 689.30 : x
2. Step 2: Convert to fraction form
   1,109.08/1,530.52 = 689.30/x
3. Step 3: Cross multiply
   1,109.08x = 1,530.52 × 689.30
4. Step 4: Simplify right side
   1,109.08x = 1,054,987.44
5. Step 5: Solve for x
   x = 1,054,987.44/1,109.08
6. Step 6: Final answer
   x = 951.23