Finding the Fourth Proportional to 102,808.72, 154,099.72 and 67,255.28

Step by Step Solution

1. Step 1: Write the proportion equation
   102,808.72 : 154,099.72 = 67,255.28 : x
2. Step 2: Convert to fraction form
   102,808.72/154,099.72 = 67,255.28/x
3. Step 3: Cross multiply
   102,808.72x = 154,099.72 × 67,255.28
4. Step 4: Simplify right side
   102,808.72x = 10,364,019,816.52
5. Step 5: Solve for x
   x = 10,364,019,816.52/102,808.72
6. Step 6: Final answer
   x = 100,808.76