Finding the Fourth Proportional to 39,898.09, 55,059.51 and 21,748.72

Step by Step Solution

1. Step 1: Write the proportion equation
   39,898.09 : 55,059.51 = 21,748.72 : x
2. Step 2: Convert to fraction form
   39,898.09/55,059.51 = 21,748.72/x
3. Step 3: Cross multiply
   39,898.09x = 55,059.51 × 21,748.72
4. Step 4: Simplify right side
   39,898.09x = 1,197,473,866.33
5. Step 5: Solve for x
   x = 1,197,473,866.33/39,898.09
6. Step 6: Final answer
   x = 30,013.31