Finding the Fourth Proportional to 31,028.72, 42,820.07 and 16,881.57

Step by Step Solution

1. Step 1: Write the proportion equation
   31,028.72 : 42,820.07 = 16,881.57 : x
2. Step 2: Convert to fraction form
   31,028.72/42,820.07 = 16,881.57/x
3. Step 3: Cross multiply
   31,028.72x = 42,820.07 × 16,881.57
4. Step 4: Simplify right side
   31,028.72x = 722,869,924.70
5. Step 5: Solve for x
   x = 722,869,924.70/31,028.72
6. Step 6: Final answer
   x = 23,296.81