Finding the Fourth Proportional to 72,424.25, 108,615.61 and 21,828.18

Step by Step Solution

1. Step 1: Write the proportion equation
   72,424.25 : 108,615.61 = 21,828.18 : x
2. Step 2: Convert to fraction form
   72,424.25/108,615.61 = 21,828.18/x
3. Step 3: Cross multiply
   72,424.25x = 108,615.61 × 21,828.18
4. Step 4: Simplify right side
   72,424.25x = 2,370,880,665.43
5. Step 5: Solve for x
   x = 2,370,880,665.43/72,424.25
6. Step 6: Final answer
   x = 32,736.01