Finding the Fourth Proportional to 1,109.21, 1,530.73 and 667.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.21 : 1,530.73 = 667.03 : x
2. Step 2: Convert to fraction form
   1,109.21/1,530.73 = 667.03/x
3. Step 3: Cross multiply
   1,109.21x = 1,530.73 × 667.03
4. Step 4: Simplify right side
   1,109.21x = 1,021,042.83
5. Step 5: Solve for x
   x = 1,021,042.83/1,109.21
6. Step 6: Final answer
   x = 920.51