Finding the Fourth Proportional to 1,109.51, 1,530.91 and 667.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.51 : 1,530.91 = 667.41 : x
2. Step 2: Convert to fraction form
   1,109.51/1,530.91 = 667.41/x
3. Step 3: Cross multiply
   1,109.51x = 1,530.91 × 667.41
4. Step 4: Simplify right side
   1,109.51x = 1,021,744.64
5. Step 5: Solve for x
   x = 1,021,744.64/1,109.51
6. Step 6: Final answer
   x = 920.90