Finding the Fourth Proportional to 2,431.05, 3,645.81 and 787.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,431.05 : 3,645.81 = 787.29 : x
2. Step 2: Convert to fraction form
   2,431.05/3,645.81 = 787.29/x
3. Step 3: Cross multiply
   2,431.05x = 3,645.81 × 787.29
4. Step 4: Simplify right side
   2,431.05x = 2,870,309.75
5. Step 5: Solve for x
   x = 2,870,309.75/2,431.05
6. Step 6: Final answer
   x = 1,180.69