Finding the Fourth Proportional to 10,443.40, 14,412.42 and 5,728.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,443.40 : 14,412.42 = 5,728.12 : x
2. Step 2: Convert to fraction form
   10,443.40/14,412.42 = 5,728.12/x
3. Step 3: Cross multiply
   10,443.40x = 14,412.42 × 5,728.12
4. Step 4: Simplify right side
   10,443.40x = 82,556,071.25
5. Step 5: Solve for x
   x = 82,556,071.25/10,443.40
6. Step 6: Final answer
   x = 7,905.10