Finding the Fourth Proportional to 1,109.42, 1,530.95 and 689.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.42 : 1,530.95 = 689.67 : x
2. Step 2: Convert to fraction form
   1,109.42/1,530.95 = 689.67/x
3. Step 3: Cross multiply
   1,109.42x = 1,530.95 × 689.67
4. Step 4: Simplify right side
   1,109.42x = 1,055,857.21
5. Step 5: Solve for x
   x = 1,055,857.21/1,109.42
6. Step 6: Final answer
   x = 951.72