Finding the Fourth Proportional to 2,155.17, 2,974.14 and 1,223.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.17 : 2,974.14 = 1,223.67 : x
2. Step 2: Convert to fraction form
   2,155.17/2,974.14 = 1,223.67/x
3. Step 3: Cross multiply
   2,155.17x = 2,974.14 × 1,223.67
4. Step 4: Simplify right side
   2,155.17x = 3,639,373.33
5. Step 5: Solve for x
   x = 3,639,373.33/2,155.17
6. Step 6: Final answer
   x = 1,688.67