Finding the Fourth Proportional to 1,109.52, 1,529.45 and 912.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.52 : 1,529.45 = 912.69 : x
2. Step 2: Convert to fraction form
   1,109.52/1,529.45 = 912.69/x
3. Step 3: Cross multiply
   1,109.52x = 1,529.45 × 912.69
4. Step 4: Simplify right side
   1,109.52x = 1,395,913.72
5. Step 5: Solve for x
   x = 1,395,913.72/1,109.52
6. Step 6: Final answer
   x = 1,258.12