Finding the Fourth Proportional to 9,057.63, 12,499.56 and 5,283.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,057.63 : 12,499.56 = 5,283.40 : x
2. Step 2: Convert to fraction form
   9,057.63/12,499.56 = 5,283.40/x
3. Step 3: Cross multiply
   9,057.63x = 12,499.56 × 5,283.40
4. Step 4: Simplify right side
   9,057.63x = 66,040,175.30
5. Step 5: Solve for x
   x = 66,040,175.30/9,057.63
6. Step 6: Final answer
   x = 7,291.11