Finding the Fourth Proportional to 39,725.74, 54,818.83 and 21,821.50

Step by Step Solution

1. Step 1: Write the proportion equation
   39,725.74 : 54,818.83 = 21,821.50 : x
2. Step 2: Convert to fraction form
   39,725.74/54,818.83 = 21,821.50/x
3. Step 3: Cross multiply
   39,725.74x = 54,818.83 × 21,821.50
4. Step 4: Simplify right side
   39,725.74x = 1,196,229,071.90
5. Step 5: Solve for x
   x = 1,196,229,071.90/39,725.74
6. Step 6: Final answer
   x = 30,112.19