Finding the Fourth Proportional to 39,898.38, 55,058.71 and 21,993.46

Step by Step Solution

1. Step 1: Write the proportion equation
   39,898.38 : 55,058.71 = 21,993.46 : x
2. Step 2: Convert to fraction form
   39,898.38/55,058.71 = 21,993.46/x
3. Step 3: Cross multiply
   39,898.38x = 55,058.71 × 21,993.46
4. Step 4: Simplify right side
   39,898.38x = 1,210,931,536.04
5. Step 5: Solve for x
   x = 1,210,931,536.04/39,898.38
6. Step 6: Final answer
   x = 30,350.39