Finding the Fourth Proportional to 53,153.37, 79,728.06 and 13,172.47

Step by Step Solution

1. Step 1: Write the proportion equation
   53,153.37 : 79,728.06 = 13,172.47 : x
2. Step 2: Convert to fraction form
   53,153.37/79,728.06 = 13,172.47/x
3. Step 3: Cross multiply
   53,153.37x = 79,728.06 × 13,172.47
4. Step 4: Simplify right side
   53,153.37x = 1,050,215,014.01
5. Step 5: Solve for x
   x = 1,050,215,014.01/53,153.37
6. Step 6: Final answer
   x = 19,758.20