Finding the Fourth Proportional to 31,013.67, 42,800.74 and 18,275.35

Step by Step Solution

1. Step 1: Write the proportion equation
   31,013.67 : 42,800.74 = 18,275.35 : x
2. Step 2: Convert to fraction form
   31,013.67/42,800.74 = 18,275.35/x
3. Step 3: Cross multiply
   31,013.67x = 42,800.74 × 18,275.35
4. Step 4: Simplify right side
   31,013.67x = 782,198,503.76
5. Step 5: Solve for x
   x = 782,198,503.76/31,013.67
6. Step 6: Final answer
   x = 25,221.09