Finding the Fourth Proportional to 2,285.03, 3,152.81 and 1,388.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,285.03 : 3,152.81 = 1,388.57 : x
2. Step 2: Convert to fraction form
   2,285.03/3,152.81 = 1,388.57/x
3. Step 3: Cross multiply
   2,285.03x = 3,152.81 × 1,388.57
4. Step 4: Simplify right side
   2,285.03x = 4,377,874.67
5. Step 5: Solve for x
   x = 4,377,874.67/2,285.03
6. Step 6: Final answer
   x = 1,915.90