Finding the Fourth Proportional to 2,783.94, 4,172.27 and 1,139.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,783.94 : 4,172.27 = 1,139.59 : x
2. Step 2: Convert to fraction form
   2,783.94/4,172.27 = 1,139.59/x
3. Step 3: Cross multiply
   2,783.94x = 4,172.27 × 1,139.59
4. Step 4: Simplify right side
   2,783.94x = 4,754,696.43
5. Step 5: Solve for x
   x = 4,754,696.43/2,783.94
6. Step 6: Final answer
   x = 1,707.90