Finding the Fourth Proportional to 31,721.79, 47,588.18 and 10,663.89

Step by Step Solution

1. Step 1: Write the proportion equation
   31,721.79 : 47,588.18 = 10,663.89 : x
2. Step 2: Convert to fraction form
   31,721.79/47,588.18 = 10,663.89/x
3. Step 3: Cross multiply
   31,721.79x = 47,588.18 × 10,663.89
4. Step 4: Simplify right side
   31,721.79x = 507,475,063.50
5. Step 5: Solve for x
   x = 507,475,063.50/31,721.79
6. Step 6: Final answer
   x = 15,997.68