Finding the Fourth Proportional to 7,533.40, 10,389.31 and 5,142.28

Step by Step Solution

1. Step 1: Write the proportion equation
   7,533.40 : 10,389.31 = 5,142.28 : x
2. Step 2: Convert to fraction form
   7,533.40/10,389.31 = 5,142.28/x
3. Step 3: Cross multiply
   7,533.40x = 10,389.31 × 5,142.28
4. Step 4: Simplify right side
   7,533.40x = 53,424,741.03
5. Step 5: Solve for x
   x = 53,424,741.03/7,533.40
6. Step 6: Final answer
   x = 7,091.72