Finding the Fourth Proportional to 31,035.46, 42,879.10 and 21,645.94

Step by Step Solution

1. Step 1: Write the proportion equation
   31,035.46 : 42,879.10 = 21,645.94 : x
2. Step 2: Convert to fraction form
   31,035.46/42,879.10 = 21,645.94/x
3. Step 3: Cross multiply
   31,035.46x = 42,879.10 × 21,645.94
4. Step 4: Simplify right side
   31,035.46x = 928,158,425.85
5. Step 5: Solve for x
   x = 928,158,425.85/31,035.46
6. Step 6: Final answer
   x = 29,906.39