Finding the Fourth Proportional to 1,404, 1,936.80 and 1,072.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404 : 1,936.80 = 1,072.08 : x
2. Step 2: Convert to fraction form
   1,404/1,936.80 = 1,072.08/x
3. Step 3: Cross multiply
   1,404x = 1,936.80 × 1,072.08
4. Step 4: Simplify right side
   1,404x = 2,076,404.54
5. Step 5: Solve for x
   x = 2,076,404.54/1,404
6. Step 6: Final answer
   x = 1,478.92