Finding the Fourth Proportional to 103,509.50, 154,496.34 and 89,216.78

Step by Step Solution

1. Step 1: Write the proportion equation
   103,509.50 : 154,496.34 = 89,216.78 : x
2. Step 2: Convert to fraction form
   103,509.50/154,496.34 = 89,216.78/x
3. Step 3: Cross multiply
   103,509.50x = 154,496.34 × 89,216.78
4. Step 4: Simplify right side
   103,509.50x = 13,783,665,204.10
5. Step 5: Solve for x
   x = 13,783,665,204.10/103,509.50
6. Step 6: Final answer
   x = 133,163.29