Finding the Fourth Proportional to 333.50, 500.16 and 128.10

Step by Step Solution

1. Step 1: Write the proportion equation
   333.50 : 500.16 = 128.10 : x
2. Step 2: Convert to fraction form
   333.50/500.16 = 128.10/x
3. Step 3: Cross multiply
   333.50x = 500.16 × 128.10
4. Step 4: Simplify right side
   333.50x = 64,070.50
5. Step 5: Solve for x
   x = 64,070.50/333.50
6. Step 6: Final answer
   x = 192.12