Finding the Fourth Proportional to 28,293.27, 42,581.94 and 21,309.45

Step by Step Solution

1. Step 1: Write the proportion equation
   28,293.27 : 42,581.94 = 21,309.45 : x
2. Step 2: Convert to fraction form
   28,293.27/42,581.94 = 21,309.45/x
3. Step 3: Cross multiply
   28,293.27x = 42,581.94 × 21,309.45
4. Step 4: Simplify right side
   28,293.27x = 907,397,721.33
5. Step 5: Solve for x
   x = 907,397,721.33/28,293.27
6. Step 6: Final answer
   x = 32,071.15