Finding the Fourth Proportional to 1,578.76, 2,178.60 and 880.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578.76 : 2,178.60 = 880.12 : x
2. Step 2: Convert to fraction form
   1,578.76/2,178.60 = 880.12/x
3. Step 3: Cross multiply
   1,578.76x = 2,178.60 × 880.12
4. Step 4: Simplify right side
   1,578.76x = 1,917,429.43
5. Step 5: Solve for x
   x = 1,917,429.43/1,578.76
6. Step 6: Final answer
   x = 1,214.52