Finding the Fourth Proportional to 31,086.72, 46,612.80 and 12,365.28

Step by Step Solution

1. Step 1: Write the proportion equation
   31,086.72 : 46,612.80 = 12,365.28 : x
2. Step 2: Convert to fraction form
   31,086.72/46,612.80 = 12,365.28/x
3. Step 3: Cross multiply
   31,086.72x = 46,612.80 × 12,365.28
4. Step 4: Simplify right side
   31,086.72x = 576,380,323.58
5. Step 5: Solve for x
   x = 576,380,323.58/31,086.72
6. Step 6: Final answer
   x = 18,541.05