Finding the Fourth Proportional to 1,578.78, 2,377.35 and 1,170.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578.78 : 2,377.35 = 1,170.81 : x
2. Step 2: Convert to fraction form
   1,578.78/2,377.35 = 1,170.81/x
3. Step 3: Cross multiply
   1,578.78x = 2,377.35 × 1,170.81
4. Step 4: Simplify right side
   1,578.78x = 2,783,425.15
5. Step 5: Solve for x
   x = 2,783,425.15/1,578.78
6. Step 6: Final answer
   x = 1,763.02