Finding the Fourth Proportional to 2,155.92, 2,975.18 and 1,224.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.92 : 2,975.18 = 1,224.42 : x
2. Step 2: Convert to fraction form
   2,155.92/2,975.18 = 1,224.42/x
3. Step 3: Cross multiply
   2,155.92x = 2,975.18 × 1,224.42
4. Step 4: Simplify right side
   2,155.92x = 3,642,869.90
5. Step 5: Solve for x
   x = 3,642,869.90/2,155.92
6. Step 6: Final answer
   x = 1,689.71