Finding the Fourth Proportional to 3,931.61, 5,425.72 and 2,163.17

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.61 : 5,425.72 = 2,163.17 : x
2. Step 2: Convert to fraction form
   3,931.61/5,425.72 = 2,163.17/x
3. Step 3: Cross multiply
   3,931.61x = 5,425.72 × 2,163.17
4. Step 4: Simplify right side
   3,931.61x = 11,736,762.89
5. Step 5: Solve for x
   x = 11,736,762.89/3,931.61
6. Step 6: Final answer
   x = 2,985.23