Finding the Fourth Proportional to 9,513.17, 13,128.54 and 5,321.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,513.17 : 13,128.54 = 5,321.42 : x
2. Step 2: Convert to fraction form
   9,513.17/13,128.54 = 5,321.42/x
3. Step 3: Cross multiply
   9,513.17x = 13,128.54 × 5,321.42
4. Step 4: Simplify right side
   9,513.17x = 69,862,475.33
5. Step 5: Solve for x
   x = 69,862,475.33/9,513.17
6. Step 6: Final answer
   x = 7,343.76