Finding the Fourth Proportional to 31,083.24, 42,881.18 and 21,008

Step by Step Solution

1. Step 1: Write the proportion equation
   31,083.24 : 42,881.18 = 21,008 : x
2. Step 2: Convert to fraction form
   31,083.24/42,881.18 = 21,008/x
3. Step 3: Cross multiply
   31,083.24x = 42,881.18 × 21,008
4. Step 4: Simplify right side
   31,083.24x = 900,847,829.44
5. Step 5: Solve for x
   x = 900,847,829.44/31,083.24
6. Step 6: Final answer
   x = 28,981.79