Finding the Fourth Proportional to 3,968.64, 5,470.38 and 3,128.00

Step by Step Solution

1. Step 1: Write the proportion equation
   3,968.64 : 5,470.38 = 3,128.00 : x
2. Step 2: Convert to fraction form
   3,968.64/5,470.38 = 3,128.00/x
3. Step 3: Cross multiply
   3,968.64x = 5,470.38 × 3,128.00
4. Step 4: Simplify right side
   3,968.64x = 17,111,321.29
5. Step 5: Solve for x
   x = 17,111,321.29/3,968.64
6. Step 6: Final answer
   x = 4,311.63