Finding the Fourth Proportional to 2,171.94, 3,258.72 and 938.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.94 : 3,258.72 = 938.86 : x
2. Step 2: Convert to fraction form
   2,171.94/3,258.72 = 938.86/x
3. Step 3: Cross multiply
   2,171.94x = 3,258.72 × 938.86
4. Step 4: Simplify right side
   2,171.94x = 3,059,481.86
5. Step 5: Solve for x
   x = 3,059,481.86/2,171.94
6. Step 6: Final answer
   x = 1,408.64