Finding the Fourth Proportional to 31,053.20, 42,851 and 16,905.76

Step by Step Solution

1. Step 1: Write the proportion equation
   31,053.20 : 42,851 = 16,905.76 : x
2. Step 2: Convert to fraction form
   31,053.20/42,851 = 16,905.76/x
3. Step 3: Cross multiply
   31,053.20x = 42,851 × 16,905.76
4. Step 4: Simplify right side
   31,053.20x = 724,428,721.76
5. Step 5: Solve for x
   x = 724,428,721.76/31,053.20
6. Step 6: Final answer
   x = 23,328.63