Finding the Fourth Proportional to 1,578.48, 2,362.84 and 874.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578.48 : 2,362.84 = 874.72 : x
2. Step 2: Convert to fraction form
   1,578.48/2,362.84 = 874.72/x
3. Step 3: Cross multiply
   1,578.48x = 2,362.84 × 874.72
4. Step 4: Simplify right side
   1,578.48x = 2,066,823.40
5. Step 5: Solve for x
   x = 2,066,823.40/1,578.48
6. Step 6: Final answer
   x = 1,309.38