Finding the Fourth Proportional to 1,379.40, 1,905.16 and 936.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.40 : 1,905.16 = 936.50 : x
2. Step 2: Convert to fraction form
   1,379.40/1,905.16 = 936.50/x
3. Step 3: Cross multiply
   1,379.40x = 1,905.16 × 936.50
4. Step 4: Simplify right side
   1,379.40x = 1,784,182.34
5. Step 5: Solve for x
   x = 1,784,182.34/1,379.40
6. Step 6: Final answer
   x = 1,293.45