Finding the Fourth Proportional to 1,578.72, 2,178.72 and 880.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578.72 : 2,178.72 = 880.08 : x
2. Step 2: Convert to fraction form
   1,578.72/2,178.72 = 880.08/x
3. Step 3: Cross multiply
   1,578.72x = 2,178.72 × 880.08
4. Step 4: Simplify right side
   1,578.72x = 1,917,447.90
5. Step 5: Solve for x
   x = 1,917,447.90/1,578.72
6. Step 6: Final answer
   x = 1,214.56