Finding the Fourth Proportional to 2,152.47, 3,228.89 and 919.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,152.47 : 3,228.89 = 919.89 : x
2. Step 2: Convert to fraction form
   2,152.47/3,228.89 = 919.89/x
3. Step 3: Cross multiply
   2,152.47x = 3,228.89 × 919.89
4. Step 4: Simplify right side
   2,152.47x = 2,970,219.02
5. Step 5: Solve for x
   x = 2,970,219.02/2,152.47
6. Step 6: Final answer
   x = 1,379.91