Finding the Fourth Proportional to 1,109.15, 1,530.12 and 666.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.15 : 1,530.12 = 666.29 : x
2. Step 2: Convert to fraction form
   1,109.15/1,530.12 = 666.29/x
3. Step 3: Cross multiply
   1,109.15x = 1,530.12 × 666.29
4. Step 4: Simplify right side
   1,109.15x = 1,019,503.65
5. Step 5: Solve for x
   x = 1,019,503.65/1,109.15
6. Step 6: Final answer
   x = 919.18