Finding the Fourth Proportional to 1,379.74, 1,902.17 and 936.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.74 : 1,902.17 = 936.87 : x
2. Step 2: Convert to fraction form
   1,379.74/1,902.17 = 936.87/x
3. Step 3: Cross multiply
   1,379.74x = 1,902.17 × 936.87
4. Step 4: Simplify right side
   1,379.74x = 1,782,086.01
5. Step 5: Solve for x
   x = 1,782,086.01/1,379.74
6. Step 6: Final answer
   x = 1,291.61