Finding the Fourth Proportional to 2,431.08, 3,644.86 and 786.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,431.08 : 3,644.86 = 786.69 : x
2. Step 2: Convert to fraction form
   2,431.08/3,644.86 = 786.69/x
3. Step 3: Cross multiply
   2,431.08x = 3,644.86 × 786.69
4. Step 4: Simplify right side
   2,431.08x = 2,867,374.91
5. Step 5: Solve for x
   x = 2,867,374.91/2,431.08
6. Step 6: Final answer
   x = 1,179.47