Finding the Fourth Proportional to 31,127.62, 42,922.06 and 21,038.58

Step by Step Solution

1. Step 1: Write the proportion equation
   31,127.62 : 42,922.06 = 21,038.58 : x
2. Step 2: Convert to fraction form
   31,127.62/42,922.06 = 21,038.58/x
3. Step 3: Cross multiply
   31,127.62x = 42,922.06 × 21,038.58
4. Step 4: Simplify right side
   31,127.62x = 903,019,193.07
5. Step 5: Solve for x
   x = 903,019,193.07/31,127.62
6. Step 6: Final answer
   x = 29,010.22