Finding the Fourth Proportional to 1,379.20, 1,903.30 and 749.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.20 : 1,903.30 = 749.73 : x
2. Step 2: Convert to fraction form
   1,379.20/1,903.30 = 749.73/x
3. Step 3: Cross multiply
   1,379.20x = 1,903.30 × 749.73
4. Step 4: Simplify right side
   1,379.20x = 1,426,951.59
5. Step 5: Solve for x
   x = 1,426,951.59/1,379.20
6. Step 6: Final answer
   x = 1,034.63