Finding the Fourth Proportional to 31,078.29, 42,873.37 and 21,010.26

Step by Step Solution

1. Step 1: Write the proportion equation
   31,078.29 : 42,873.37 = 21,010.26 : x
2. Step 2: Convert to fraction form
   31,078.29/42,873.37 = 21,010.26/x
3. Step 3: Cross multiply
   31,078.29x = 42,873.37 × 21,010.26
4. Step 4: Simplify right side
   31,078.29x = 900,780,650.78
5. Step 5: Solve for x
   x = 900,780,650.78/31,078.29
6. Step 6: Final answer
   x = 28,984.24