Finding the Fourth Proportional to 2,151.32, 3,227.58 and 918.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.32 : 3,227.58 = 918.80 : x
2. Step 2: Convert to fraction form
   2,151.32/3,227.58 = 918.80/x
3. Step 3: Cross multiply
   2,151.32x = 3,227.58 × 918.80
4. Step 4: Simplify right side
   2,151.32x = 2,965,500.50
5. Step 5: Solve for x
   x = 2,965,500.50/2,151.32
6. Step 6: Final answer
   x = 1,378.46