Finding the Fourth Proportional to 2,152.56, 3,229.70 and 919.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,152.56 : 3,229.70 = 919.94 : x
2. Step 2: Convert to fraction form
   2,152.56/3,229.70 = 919.94/x
3. Step 3: Cross multiply
   2,152.56x = 3,229.70 × 919.94
4. Step 4: Simplify right side
   2,152.56x = 2,971,109.47
5. Step 5: Solve for x
   x = 2,971,109.47/2,152.56
6. Step 6: Final answer
   x = 1,380.27