Finding the Fourth Proportional to 1,109.94, 1,530.09 and 911.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.94 : 1,530.09 = 911.89 : x
2. Step 2: Convert to fraction form
   1,109.94/1,530.09 = 911.89/x
3. Step 3: Cross multiply
   1,109.94x = 1,530.09 × 911.89
4. Step 4: Simplify right side
   1,109.94x = 1,395,275.68
5. Step 5: Solve for x
   x = 1,395,275.68/1,109.94
6. Step 6: Final answer
   x = 1,257.08