Finding the Fourth Proportional to 1,578.94, 2,178.93 and 870.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578.94 : 2,178.93 = 870.82 : x
2. Step 2: Convert to fraction form
   1,578.94/2,178.93 = 870.82/x
3. Step 3: Cross multiply
   1,578.94x = 2,178.93 × 870.82
4. Step 4: Simplify right side
   1,578.94x = 1,897,455.82
5. Step 5: Solve for x
   x = 1,897,455.82/1,578.94
6. Step 6: Final answer
   x = 1,201.73