Finding the Fourth Proportional to 31,055, 42,855.72 and 17,628.80

Step by Step Solution

1. Step 1: Write the proportion equation
   31,055 : 42,855.72 = 17,628.80 : x
2. Step 2: Convert to fraction form
   31,055/42,855.72 = 17,628.80/x
3. Step 3: Cross multiply
   31,055x = 42,855.72 × 17,628.80
4. Step 4: Simplify right side
   31,055x = 755,494,916.74
5. Step 5: Solve for x
   x = 755,494,916.74/31,055
6. Step 6: Final answer
   x = 24,327.64