Finding the Fourth Proportional to 2,278, 3,142.61 and 1,393.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,278 : 3,142.61 = 1,393.64 : x
2. Step 2: Convert to fraction form
   2,278/3,142.61 = 1,393.64/x
3. Step 3: Cross multiply
   2,278x = 3,142.61 × 1,393.64
4. Step 4: Simplify right side
   2,278x = 4,379,667.00
5. Step 5: Solve for x
   x = 4,379,667.00/2,278
6. Step 6: Final answer
   x = 1,922.59