Finding the Fourth Proportional to 7,485.78, 10,329.90 and 4,128.41

Step by Step Solution

1. Step 1: Write the proportion equation
   7,485.78 : 10,329.90 = 4,128.41 : x
2. Step 2: Convert to fraction form
   7,485.78/10,329.90 = 4,128.41/x
3. Step 3: Cross multiply
   7,485.78x = 10,329.90 × 4,128.41
4. Step 4: Simplify right side
   7,485.78x = 42,646,010.81
5. Step 5: Solve for x
   x = 42,646,010.81/7,485.78
6. Step 6: Final answer
   x = 5,696.94