Finding the Fourth Proportional to 9,513.81, 13,128.12 and 5,535.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,513.81 : 13,128.12 = 5,535.09 : x
2. Step 2: Convert to fraction form
   9,513.81/13,128.12 = 5,535.09/x
3. Step 3: Cross multiply
   9,513.81x = 13,128.12 × 5,535.09
4. Step 4: Simplify right side
   9,513.81x = 72,665,325.73
5. Step 5: Solve for x
   x = 72,665,325.73/9,513.81
6. Step 6: Final answer
   x = 7,637.88