Finding the Fourth Proportional to 1,382.72, 1,908.48 and 940.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,382.72 : 1,908.48 = 940.80 : x
2. Step 2: Convert to fraction form
   1,382.72/1,908.48 = 940.80/x
3. Step 3: Cross multiply
   1,382.72x = 1,908.48 × 940.80
4. Step 4: Simplify right side
   1,382.72x = 1,795,497.98
5. Step 5: Solve for x
   x = 1,795,497.98/1,382.72
6. Step 6: Final answer
   x = 1,298.53