Finding the Fourth Proportional to 31,978.68, 47,940.66 and 12,271.38

Step by Step Solution

1. Step 1: Write the proportion equation
   31,978.68 : 47,940.66 = 12,271.38 : x
2. Step 2: Convert to fraction form
   31,978.68/47,940.66 = 12,271.38/x
3. Step 3: Cross multiply
   31,978.68x = 47,940.66 × 12,271.38
4. Step 4: Simplify right side
   31,978.68x = 588,298,056.31
5. Step 5: Solve for x
   x = 588,298,056.31/31,978.68
6. Step 6: Final answer
   x = 18,396.57