Finding the Fourth Proportional to 1,109.56, 1,530.66 and 667.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.56 : 1,530.66 = 667.30 : x
2. Step 2: Convert to fraction form
   1,109.56/1,530.66 = 667.30/x
3. Step 3: Cross multiply
   1,109.56x = 1,530.66 × 667.30
4. Step 4: Simplify right side
   1,109.56x = 1,021,409.42
5. Step 5: Solve for x
   x = 1,021,409.42/1,109.56
6. Step 6: Final answer
   x = 920.55