Finding the Fourth Proportional to 7,485.48, 10,329.48 and 4,128.31

Step by Step Solution

1. Step 1: Write the proportion equation
   7,485.48 : 10,329.48 = 4,128.31 : x
2. Step 2: Convert to fraction form
   7,485.48/10,329.48 = 4,128.31/x
3. Step 3: Cross multiply
   7,485.48x = 10,329.48 × 4,128.31
4. Step 4: Simplify right side
   7,485.48x = 42,643,293.01
5. Step 5: Solve for x
   x = 42,643,293.01/7,485.48
6. Step 6: Final answer
   x = 5,696.80