Finding the Fourth Proportional to 31,862.84, 47,766.31 and 12,128.27

Step by Step Solution

1. Step 1: Write the proportion equation
   31,862.84 : 47,766.31 = 12,128.27 : x
2. Step 2: Convert to fraction form
   31,862.84/47,766.31 = 12,128.27/x
3. Step 3: Cross multiply
   31,862.84x = 47,766.31 × 12,128.27
4. Step 4: Simplify right side
   31,862.84x = 579,322,435.43
5. Step 5: Solve for x
   x = 579,322,435.43/31,862.84
6. Step 6: Final answer
   x = 18,181.76