Finding the Fourth Proportional to 3,418.82, 5,128.17 and 953.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,418.82 : 5,128.17 = 953.78 : x
2. Step 2: Convert to fraction form
   3,418.82/5,128.17 = 953.78/x
3. Step 3: Cross multiply
   3,418.82x = 5,128.17 × 953.78
4. Step 4: Simplify right side
   3,418.82x = 4,891,145.98
5. Step 5: Solve for x
   x = 4,891,145.98/3,418.82
6. Step 6: Final answer
   x = 1,430.65