Finding the Fourth Proportional to 1,384.38, 1,911.78 and 1,107.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.38 : 1,911.78 = 1,107.54 : x
2. Step 2: Convert to fraction form
   1,384.38/1,911.78 = 1,107.54/x
3. Step 3: Cross multiply
   1,384.38x = 1,911.78 × 1,107.54
4. Step 4: Simplify right side
   1,384.38x = 2,117,372.82
5. Step 5: Solve for x
   x = 2,117,372.82/1,384.38
6. Step 6: Final answer
   x = 1,529.47