Finding the Fourth Proportional to 1,945.98, 2,917.67 and 905.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,945.98 : 2,917.67 = 905.40 : x
2. Step 2: Convert to fraction form
   1,945.98/2,917.67 = 905.40/x
3. Step 3: Cross multiply
   1,945.98x = 2,917.67 × 905.40
4. Step 4: Simplify right side
   1,945.98x = 2,641,658.42
5. Step 5: Solve for x
   x = 2,641,658.42/1,945.98
6. Step 6: Final answer
   x = 1,357.50