Finding the Fourth Proportional to 31,111.22, 42,919.82 and 21,036.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,111.22 : 42,919.82 = 21,036.02 : x
2. Step 2: Convert to fraction form
   31,111.22/42,919.82 = 21,036.02/x
3. Step 3: Cross multiply
   31,111.22x = 42,919.82 × 21,036.02
4. Step 4: Simplify right side
   31,111.22x = 902,862,191.92
5. Step 5: Solve for x
   x = 902,862,191.92/31,111.22
6. Step 6: Final answer
   x = 29,020.47