Finding the Fourth Proportional to 1,109.37, 1,530.33 and 666.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.37 : 1,530.33 = 666.99 : x
2. Step 2: Convert to fraction form
   1,109.37/1,530.33 = 666.99/x
3. Step 3: Cross multiply
   1,109.37x = 1,530.33 × 666.99
4. Step 4: Simplify right side
   1,109.37x = 1,020,714.81
5. Step 5: Solve for x
   x = 1,020,714.81/1,109.37
6. Step 6: Final answer
   x = 920.09