Finding the Fourth Proportional to 1,380.63, 1,904.88 and 849.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.63 : 1,904.88 = 849.34 : x
2. Step 2: Convert to fraction form
   1,380.63/1,904.88 = 849.34/x
3. Step 3: Cross multiply
   1,380.63x = 1,904.88 × 849.34
4. Step 4: Simplify right side
   1,380.63x = 1,617,890.78
5. Step 5: Solve for x
   x = 1,617,890.78/1,380.63
6. Step 6: Final answer
   x = 1,171.85