Finding the Fourth Proportional to 5,485.94, 7,570.78 and 3,128.04

Step by Step Solution

1. Step 1: Write the proportion equation
   5,485.94 : 7,570.78 = 3,128.04 : x
2. Step 2: Convert to fraction form
   5,485.94/7,570.78 = 3,128.04/x
3. Step 3: Cross multiply
   5,485.94x = 7,570.78 × 3,128.04
4. Step 4: Simplify right side
   5,485.94x = 23,681,702.67
5. Step 5: Solve for x
   x = 23,681,702.67/5,485.94
6. Step 6: Final answer
   x = 4,316.80