Finding the Fourth Proportional to 1,384.78, 1,910.10 and 919.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.78 : 1,910.10 = 919.04 : x
2. Step 2: Convert to fraction form
   1,384.78/1,910.10 = 919.04/x
3. Step 3: Cross multiply
   1,384.78x = 1,910.10 × 919.04
4. Step 4: Simplify right side
   1,384.78x = 1,755,458.30
5. Step 5: Solve for x
   x = 1,755,458.30/1,384.78
6. Step 6: Final answer
   x = 1,267.68