Finding the Fourth Proportional to 2,939.31, 4,410.70 and 1,091.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,939.31 : 4,410.70 = 1,091.72 : x
2. Step 2: Convert to fraction form
   2,939.31/4,410.70 = 1,091.72/x
3. Step 3: Cross multiply
   2,939.31x = 4,410.70 × 1,091.72
4. Step 4: Simplify right side
   2,939.31x = 4,815,257.70
5. Step 5: Solve for x
   x = 4,815,257.70/2,939.31
6. Step 6: Final answer
   x = 1,638.23