Finding the Fourth Proportional to 1,105.89, 1,524.45 and 909.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.89 : 1,524.45 = 909.06 : x
2. Step 2: Convert to fraction form
   1,105.89/1,524.45 = 909.06/x
3. Step 3: Cross multiply
   1,105.89x = 1,524.45 × 909.06
4. Step 4: Simplify right side
   1,105.89x = 1,385,814.21
5. Step 5: Solve for x
   x = 1,385,814.21/1,105.89
6. Step 6: Final answer
   x = 1,253.13