Finding the Fourth Proportional to 2,629.72, 3,945.30 and 1,091.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,629.72 : 3,945.30 = 1,091.80 : x
2. Step 2: Convert to fraction form
   2,629.72/3,945.30 = 1,091.80/x
3. Step 3: Cross multiply
   2,629.72x = 3,945.30 × 1,091.80
4. Step 4: Simplify right side
   2,629.72x = 4,307,478.54
5. Step 5: Solve for x
   x = 4,307,478.54/2,629.72
6. Step 6: Final answer
   x = 1,638.00