Finding the Fourth Proportional to 31,980.20, 44,140.59 and 21,788.09

Step by Step Solution

1. Step 1: Write the proportion equation
   31,980.20 : 44,140.59 = 21,788.09 : x
2. Step 2: Convert to fraction form
   31,980.20/44,140.59 = 21,788.09/x
3. Step 3: Cross multiply
   31,980.20x = 44,140.59 × 21,788.09
4. Step 4: Simplify right side
   31,980.20x = 961,739,340.69
5. Step 5: Solve for x
   x = 961,739,340.69/31,980.20
6. Step 6: Final answer
   x = 30,072.96