Finding the Fourth Proportional to 31,787.52, 43,856.64 and 18,357

Step by Step Solution

1. Step 1: Write the proportion equation
   31,787.52 : 43,856.64 = 18,357 : x
2. Step 2: Convert to fraction form
   31,787.52/43,856.64 = 18,357/x
3. Step 3: Cross multiply
   31,787.52x = 43,856.64 × 18,357
4. Step 4: Simplify right side
   31,787.52x = 805,076,340.48
5. Step 5: Solve for x
   x = 805,076,340.48/31,787.52
6. Step 6: Final answer
   x = 25,326.81