Finding the Fourth Proportional to 51,056.72, 76,588.73 and 13,616.60

Step by Step Solution

1. Step 1: Write the proportion equation
   51,056.72 : 76,588.73 = 13,616.60 : x
2. Step 2: Convert to fraction form
   51,056.72/76,588.73 = 13,616.60/x
3. Step 3: Cross multiply
   51,056.72x = 76,588.73 × 13,616.60
4. Step 4: Simplify right side
   51,056.72x = 1,042,877,649.89
5. Step 5: Solve for x
   x = 1,042,877,649.89/51,056.72
6. Step 6: Final answer
   x = 20,425.87