Finding the Fourth Proportional to 31,936.32, 47,892.96 and 13,469.76

Step by Step Solution

1. Step 1: Write the proportion equation
   31,936.32 : 47,892.96 = 13,469.76 : x
2. Step 2: Convert to fraction form
   31,936.32/47,892.96 = 13,469.76/x
3. Step 3: Cross multiply
   31,936.32x = 47,892.96 × 13,469.76
4. Step 4: Simplify right side
   31,936.32x = 645,106,676.89
5. Step 5: Solve for x
   x = 645,106,676.89/31,936.32
6. Step 6: Final answer
   x = 20,199.78