Finding the Fourth Proportional to 39,608.48, 54,659.69 and 21,704.15

Step by Step Solution

1. Step 1: Write the proportion equation
   39,608.48 : 54,659.69 = 21,704.15 : x
2. Step 2: Convert to fraction form
   39,608.48/54,659.69 = 21,704.15/x
3. Step 3: Cross multiply
   39,608.48x = 54,659.69 × 21,704.15
4. Step 4: Simplify right side
   39,608.48x = 1,186,342,002.19
5. Step 5: Solve for x
   x = 1,186,342,002.19/39,608.48
6. Step 6: Final answer
   x = 29,951.72