Finding the Fourth Proportional to 2,151.29, 3,227.27 and 918.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.29 : 3,227.27 = 918.70 : x
2. Step 2: Convert to fraction form
   2,151.29/3,227.27 = 918.70/x
3. Step 3: Cross multiply
   2,151.29x = 3,227.27 × 918.70
4. Step 4: Simplify right side
   2,151.29x = 2,964,901.02
5. Step 5: Solve for x
   x = 2,964,901.02/2,151.29
6. Step 6: Final answer
   x = 1,378.20