Finding the Fourth Proportional to 3,418.89, 5,128.31 and 953.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,418.89 : 5,128.31 = 953.72 : x
2. Step 2: Convert to fraction form
   3,418.89/5,128.31 = 953.72/x
3. Step 3: Cross multiply
   3,418.89x = 5,128.31 × 953.72
4. Step 4: Simplify right side
   3,418.89x = 4,890,962.42
5. Step 5: Solve for x
   x = 4,890,962.42/3,418.89
6. Step 6: Final answer
   x = 1,430.57