Finding the Fourth Proportional to 2,557.65, 3,840.12 and 1,945.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.65 : 3,840.12 = 1,945.29 : x
2. Step 2: Convert to fraction form
   2,557.65/3,840.12 = 1,945.29/x
3. Step 3: Cross multiply
   2,557.65x = 3,840.12 × 1,945.29
4. Step 4: Simplify right side
   2,557.65x = 7,470,153.37
5. Step 5: Solve for x
   x = 7,470,153.37/2,557.65
6. Step 6: Final answer
   x = 2,920.71