Finding the Fourth Proportional to 31,122, 42,933.56 and 21,053.97

Step by Step Solution

1. Step 1: Write the proportion equation
   31,122 : 42,933.56 = 21,053.97 : x
2. Step 2: Convert to fraction form
   31,122/42,933.56 = 21,053.97/x
3. Step 3: Cross multiply
   31,122x = 42,933.56 × 21,053.97
4. Step 4: Simplify right side
   31,122x = 903,921,778.96
5. Step 5: Solve for x
   x = 903,921,778.96/31,122
6. Step 6: Final answer
   x = 29,044.46