Finding the Fourth Proportional to 39,308.96, 54,245.61 and 21,404.31

Step by Step Solution

1. Step 1: Write the proportion equation
   39,308.96 : 54,245.61 = 21,404.31 : x
2. Step 2: Convert to fraction form
   39,308.96/54,245.61 = 21,404.31/x
3. Step 3: Cross multiply
   39,308.96x = 54,245.61 × 21,404.31
4. Step 4: Simplify right side
   39,308.96x = 1,161,089,852.58
5. Step 5: Solve for x
   x = 1,161,089,852.58/39,308.96
6. Step 6: Final answer
   x = 29,537.54