Finding the Fourth Proportional to 2,278.18, 3,139.32 and 1,578.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,278.18 : 3,139.32 = 1,578.34 : x
2. Step 2: Convert to fraction form
   2,278.18/3,139.32 = 1,578.34/x
3. Step 3: Cross multiply
   2,278.18x = 3,139.32 × 1,578.34
4. Step 4: Simplify right side
   2,278.18x = 4,954,914.33
5. Step 5: Solve for x
   x = 4,954,914.33/2,278.18
6. Step 6: Final answer
   x = 2,174.94