Finding the Fourth Proportional to 2,155.14, 2,974.11 and 1,223.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.14 : 2,974.11 = 1,223.58 : x
2. Step 2: Convert to fraction form
   2,155.14/2,974.11 = 1,223.58/x
3. Step 3: Cross multiply
   2,155.14x = 2,974.11 × 1,223.58
4. Step 4: Simplify right side
   2,155.14x = 3,639,061.51
5. Step 5: Solve for x
   x = 3,639,061.51/2,155.14
6. Step 6: Final answer
   x = 1,688.55