Finding the Fourth Proportional to 1,641.20, 2,262.33 and 1,309.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.20 : 2,262.33 = 1,309.10 : x
2. Step 2: Convert to fraction form
   1,641.20/2,262.33 = 1,309.10/x
3. Step 3: Cross multiply
   1,641.20x = 2,262.33 × 1,309.10
4. Step 4: Simplify right side
   1,641.20x = 2,961,604.89
5. Step 5: Solve for x
   x = 2,961,604.89/1,641.20
6. Step 6: Final answer
   x = 1,804.54