Finding the Fourth Proportional to 67,910.91, 101,871.98 and 21,163.78

Step by Step Solution

1. Step 1: Write the proportion equation
   67,910.91 : 101,871.98 = 21,163.78 : x
2. Step 2: Convert to fraction form
   67,910.91/101,871.98 = 21,163.78/x
3. Step 3: Cross multiply
   67,910.91x = 101,871.98 × 21,163.78
4. Step 4: Simplify right side
   67,910.91x = 2,155,996,273.77
5. Step 5: Solve for x
   x = 2,155,996,273.77/67,910.91
6. Step 6: Final answer
   x = 31,747.42