Finding the Fourth Proportional to 1,109.10, 1,530.88 and 666.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.10 : 1,530.88 = 666.92 : x
2. Step 2: Convert to fraction form
   1,109.10/1,530.88 = 666.92/x
3. Step 3: Cross multiply
   1,109.10x = 1,530.88 × 666.92
4. Step 4: Simplify right side
   1,109.10x = 1,020,974.49
5. Step 5: Solve for x
   x = 1,020,974.49/1,109.10
6. Step 6: Final answer
   x = 920.54