Finding the Fourth Proportional to 39,898.50, 55,058.87 and 21,993.57

Step by Step Solution

1. Step 1: Write the proportion equation
   39,898.50 : 55,058.87 = 21,993.57 : x
2. Step 2: Convert to fraction form
   39,898.50/55,058.87 = 21,993.57/x
3. Step 3: Cross multiply
   39,898.50x = 55,058.87 × 21,993.57
4. Step 4: Simplify right side
   39,898.50x = 1,210,941,166.45
5. Step 5: Solve for x
   x = 1,210,941,166.45/39,898.50
6. Step 6: Final answer
   x = 30,350.55