Finding the Fourth Proportional to 2,151.72, 3,227.90 and 919.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.72 : 3,227.90 = 919.12 : x
2. Step 2: Convert to fraction form
   2,151.72/3,227.90 = 919.12/x
3. Step 3: Cross multiply
   2,151.72x = 3,227.90 × 919.12
4. Step 4: Simplify right side
   2,151.72x = 2,966,827.45
5. Step 5: Solve for x
   x = 2,966,827.45/2,151.72
6. Step 6: Final answer
   x = 1,378.82