Finding the Fourth Proportional to 3,967.61, 5,472.77 and 3,128.04

Step by Step Solution

1. Step 1: Write the proportion equation
   3,967.61 : 5,472.77 = 3,128.04 : x
2. Step 2: Convert to fraction form
   3,967.61/5,472.77 = 3,128.04/x
3. Step 3: Cross multiply
   3,967.61x = 5,472.77 × 3,128.04
4. Step 4: Simplify right side
   3,967.61x = 17,119,027.83
5. Step 5: Solve for x
   x = 17,119,027.83/3,967.61
6. Step 6: Final answer
   x = 4,314.70