Finding the Fourth Proportional to 31,028.76, 42,818.40 and 16,881.57

Step by Step Solution

1. Step 1: Write the proportion equation
   31,028.76 : 42,818.40 = 16,881.57 : x
2. Step 2: Convert to fraction form
   31,028.76/42,818.40 = 16,881.57/x
3. Step 3: Cross multiply
   31,028.76x = 42,818.40 × 16,881.57
4. Step 4: Simplify right side
   31,028.76x = 722,841,816.89
5. Step 5: Solve for x
   x = 722,841,816.89/31,028.76
6. Step 6: Final answer
   x = 23,295.87