Finding the Fourth Proportional to 31,071.29, 42,863.72 and 21,003.26

Step by Step Solution

1. Step 1: Write the proportion equation
   31,071.29 : 42,863.72 = 21,003.26 : x
2. Step 2: Convert to fraction form
   31,071.29/42,863.72 = 21,003.26/x
3. Step 3: Cross multiply
   31,071.29x = 42,863.72 × 21,003.26
4. Step 4: Simplify right side
   31,071.29x = 900,277,536.39
5. Step 5: Solve for x
   x = 900,277,536.39/31,071.29
6. Step 6: Final answer
   x = 28,974.58