Finding the Fourth Proportional to 2,789.76, 4,181.16 and 1,145.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,789.76 : 4,181.16 = 1,145.40 : x
2. Step 2: Convert to fraction form
   2,789.76/4,181.16 = 1,145.40/x
3. Step 3: Cross multiply
   2,789.76x = 4,181.16 × 1,145.40
4. Step 4: Simplify right side
   2,789.76x = 4,789,100.66
5. Step 5: Solve for x
   x = 4,789,100.66/2,789.76
6. Step 6: Final answer
   x = 1,716.67