Finding the Fourth Proportional to 1,379.80, 1,902.81 and 908.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.80 : 1,902.81 = 908.02 : x
2. Step 2: Convert to fraction form
   1,379.80/1,902.81 = 908.02/x
3. Step 3: Cross multiply
   1,379.80x = 1,902.81 × 908.02
4. Step 4: Simplify right side
   1,379.80x = 1,727,789.54
5. Step 5: Solve for x
   x = 1,727,789.54/1,379.80
6. Step 6: Final answer
   x = 1,252.20