Finding the Fourth Proportional to 2,178.47, 3,264.82 and 1,139.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178.47 : 3,264.82 = 1,139.36 : x
2. Step 2: Convert to fraction form
   2,178.47/3,264.82 = 1,139.36/x
3. Step 3: Cross multiply
   2,178.47x = 3,264.82 × 1,139.36
4. Step 4: Simplify right side
   2,178.47x = 3,719,786.14
5. Step 5: Solve for x
   x = 3,719,786.14/2,178.47
6. Step 6: Final answer
   x = 1,707.52