Finding the Fourth Proportional to 102,168.72, 140,991.48 and 57,456.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,168.72 : 140,991.48 = 57,456.72 : x
2. Step 2: Convert to fraction form
   102,168.72/140,991.48 = 57,456.72/x
3. Step 3: Cross multiply
   102,168.72x = 140,991.48 × 57,456.72
4. Step 4: Simplify right side
   102,168.72x = 8,100,907,988.75
5. Step 5: Solve for x
   x = 8,100,907,988.75/102,168.72
6. Step 6: Final answer
   x = 79,289.51