Finding the Fourth Proportional to 2,155.08, 2,974.01 and 1,223.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.08 : 2,974.01 = 1,223.58 : x
2. Step 2: Convert to fraction form
   2,155.08/2,974.01 = 1,223.58/x
3. Step 3: Cross multiply
   2,155.08x = 2,974.01 × 1,223.58
4. Step 4: Simplify right side
   2,155.08x = 3,638,934.34
5. Step 5: Solve for x
   x = 3,638,934.34/2,155.08
6. Step 6: Final answer
   x = 1,688.54