Finding the Fourth Proportional to 31,367.21, 43,227 and 30,790.76

Step by Step Solution

1. Step 1: Write the proportion equation
   31,367.21 : 43,227 = 30,790.76 : x
2. Step 2: Convert to fraction form
   31,367.21/43,227 = 30,790.76/x
3. Step 3: Cross multiply
   31,367.21x = 43,227 × 30,790.76
4. Step 4: Simplify right side
   31,367.21x = 1,330,991,966.39
5. Step 5: Solve for x
   x = 1,330,991,966.39/31,367.21
6. Step 6: Final answer
   x = 42,432.60