Finding the Fourth Proportional to 1,379.96, 1,904.64 and 849.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.96 : 1,904.64 = 849.30 : x
2. Step 2: Convert to fraction form
   1,379.96/1,904.64 = 849.30/x
3. Step 3: Cross multiply
   1,379.96x = 1,904.64 × 849.30
4. Step 4: Simplify right side
   1,379.96x = 1,617,601.23
5. Step 5: Solve for x
   x = 1,617,601.23/1,379.96
6. Step 6: Final answer
   x = 1,172.21