Finding the Fourth Proportional to 1,411.08, 1,947.92 and 939.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.08 : 1,947.92 = 939.80 : x
2. Step 2: Convert to fraction form
   1,411.08/1,947.92 = 939.80/x
3. Step 3: Cross multiply
   1,411.08x = 1,947.92 × 939.80
4. Step 4: Simplify right side
   1,411.08x = 1,830,655.22
5. Step 5: Solve for x
   x = 1,830,655.22/1,411.08
6. Step 6: Final answer
   x = 1,297.34