Finding the Fourth Proportional to 31,978.55, 47,940.47 and 12,271.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,978.55 : 47,940.47 = 12,271.25 : x
2. Step 2: Convert to fraction form
   31,978.55/47,940.47 = 12,271.25/x
3. Step 3: Cross multiply
   31,978.55x = 47,940.47 × 12,271.25
4. Step 4: Simplify right side
   31,978.55x = 588,289,492.49
5. Step 5: Solve for x
   x = 588,289,492.49/31,978.55
6. Step 6: Final answer
   x = 18,396.38