Finding the Fourth Proportional to 1,379.86, 1,903.74 and 936.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.86 : 1,903.74 = 936.99 : x
2. Step 2: Convert to fraction form
   1,379.86/1,903.74 = 936.99/x
3. Step 3: Cross multiply
   1,379.86x = 1,903.74 × 936.99
4. Step 4: Simplify right side
   1,379.86x = 1,783,792.44
5. Step 5: Solve for x
   x = 1,783,792.44/1,379.86
6. Step 6: Final answer
   x = 1,292.73