Finding the Fourth Proportional to 31,485.52, 47,228.56 and 8,111.28

Step by Step Solution

1. Step 1: Write the proportion equation
   31,485.52 : 47,228.56 = 8,111.28 : x
2. Step 2: Convert to fraction form
   31,485.52/47,228.56 = 8,111.28/x
3. Step 3: Cross multiply
   31,485.52x = 47,228.56 × 8,111.28
4. Step 4: Simplify right side
   31,485.52x = 383,084,074.16
5. Step 5: Solve for x
   x = 383,084,074.16/31,485.52
6. Step 6: Final answer
   x = 12,166.99