Finding the Fourth Proportional to 30,570.36, 42,205.50 and 19,977.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,570.36 : 42,205.50 = 19,977.72 : x
2. Step 2: Convert to fraction form
   30,570.36/42,205.50 = 19,977.72/x
3. Step 3: Cross multiply
   30,570.36x = 42,205.50 × 19,977.72
4. Step 4: Simplify right side
   30,570.36x = 843,169,661.46
5. Step 5: Solve for x
   x = 843,169,661.46/30,570.36
6. Step 6: Final answer
   x = 27,581.28