Finding the Fourth Proportional to 31,608.72, 43,628.72 and 19,664.93

Step by Step Solution

1. Step 1: Write the proportion equation
   31,608.72 : 43,628.72 = 19,664.93 : x
2. Step 2: Convert to fraction form
   31,608.72/43,628.72 = 19,664.93/x
3. Step 3: Cross multiply
   31,608.72x = 43,628.72 × 19,664.93
4. Step 4: Simplify right side
   31,608.72x = 857,955,724.79
5. Step 5: Solve for x
   x = 857,955,724.79/31,608.72
6. Step 6: Final answer
   x = 27,143.01