Finding the Fourth Proportional to 1,384.42, 1,910.28 and 1,105.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.42 : 1,910.28 = 1,105.42 : x
2. Step 2: Convert to fraction form
   1,384.42/1,910.28 = 1,105.42/x
3. Step 3: Cross multiply
   1,384.42x = 1,910.28 × 1,105.42
4. Step 4: Simplify right side
   1,384.42x = 2,111,661.72
5. Step 5: Solve for x
   x = 2,111,661.72/1,384.42
6. Step 6: Final answer
   x = 1,525.30