Finding the Fourth Proportional to 31,152.49, 42,989.61 and 28,644.73

Step by Step Solution

1. Step 1: Write the proportion equation
   31,152.49 : 42,989.61 = 28,644.73 : x
2. Step 2: Convert to fraction form
   31,152.49/42,989.61 = 28,644.73/x
3. Step 3: Cross multiply
   31,152.49x = 42,989.61 × 28,644.73
4. Step 4: Simplify right side
   31,152.49x = 1,231,425,771.26
5. Step 5: Solve for x
   x = 1,231,425,771.26/31,152.49
6. Step 6: Final answer
   x = 39,528.97