Finding the Fourth Proportional to 40,212.20, 55,559.59 and 31,779

Step by Step Solution

1. Step 1: Write the proportion equation
   40,212.20 : 55,559.59 = 31,779 : x
2. Step 2: Convert to fraction form
   40,212.20/55,559.59 = 31,779/x
3. Step 3: Cross multiply
   40,212.20x = 55,559.59 × 31,779
4. Step 4: Simplify right side
   40,212.20x = 1,765,628,131.16
5. Step 5: Solve for x
   x = 1,765,628,131.16/40,212.20
6. Step 6: Final answer
   x = 43,907.77