Finding the Fourth Proportional to 1,578.83, 2,178.78 and 880.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578.83 : 2,178.78 = 880.21 : x
2. Step 2: Convert to fraction form
   1,578.83/2,178.78 = 880.21/x
3. Step 3: Cross multiply
   1,578.83x = 2,178.78 × 880.21
4. Step 4: Simplify right side
   1,578.83x = 1,917,783.94
5. Step 5: Solve for x
   x = 1,917,783.94/1,578.83
6. Step 6: Final answer
   x = 1,214.69