Finding the Fourth Proportional to 7,345.81, 10,138.53 and 5,353.89

Step by Step Solution

1. Step 1: Write the proportion equation
   7,345.81 : 10,138.53 = 5,353.89 : x
2. Step 2: Convert to fraction form
   7,345.81/10,138.53 = 5,353.89/x
3. Step 3: Cross multiply
   7,345.81x = 10,138.53 × 5,353.89
4. Step 4: Simplify right side
   7,345.81x = 54,280,574.38
5. Step 5: Solve for x
   x = 54,280,574.38/7,345.81
6. Step 6: Final answer
   x = 7,389.32