Finding the Fourth Proportional to 1,578.72, 2,178.80 and 880.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578.72 : 2,178.80 = 880.16 : x
2. Step 2: Convert to fraction form
   1,578.72/2,178.80 = 880.16/x
3. Step 3: Cross multiply
   1,578.72x = 2,178.80 × 880.16
4. Step 4: Simplify right side
   1,578.72x = 1,917,692.61
5. Step 5: Solve for x
   x = 1,917,692.61/1,578.72
6. Step 6: Final answer
   x = 1,214.71