Finding the Fourth Proportional to 1,921.34, 2,650.78 and 1,258.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.34 : 2,650.78 = 1,258.58 : x
2. Step 2: Convert to fraction form
   1,921.34/2,650.78 = 1,258.58/x
3. Step 3: Cross multiply
   1,921.34x = 2,650.78 × 1,258.58
4. Step 4: Simplify right side
   1,921.34x = 3,336,218.69
5. Step 5: Solve for x
   x = 3,336,218.69/1,921.34
6. Step 6: Final answer
   x = 1,736.40