Finding the Fourth Proportional to 53,111.37, 79,671.15 and 13,668.87

Step by Step Solution

1. Step 1: Write the proportion equation
   53,111.37 : 79,671.15 = 13,668.87 : x
2. Step 2: Convert to fraction form
   53,111.37/79,671.15 = 13,668.87/x
3. Step 3: Cross multiply
   53,111.37x = 79,671.15 × 13,668.87
4. Step 4: Simplify right side
   53,111.37x = 1,089,014,592.10
5. Step 5: Solve for x
   x = 1,089,014,592.10/53,111.37
6. Step 6: Final answer
   x = 20,504.36