Finding the Fourth Proportional to 2,285.81, 3,154.56 and 1,291.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,285.81 : 3,154.56 = 1,291.07 : x
2. Step 2: Convert to fraction form
   2,285.81/3,154.56 = 1,291.07/x
3. Step 3: Cross multiply
   2,285.81x = 3,154.56 × 1,291.07
4. Step 4: Simplify right side
   2,285.81x = 4,072,737.16
5. Step 5: Solve for x
   x = 4,072,737.16/2,285.81
6. Step 6: Final answer
   x = 1,781.75