Finding the Fourth Proportional to 146.52, 218.61 and 128.52

Step by Step Solution

1. Step 1: Write the proportion equation
   146.52 : 218.61 = 128.52 : x
2. Step 2: Convert to fraction form
   146.52/218.61 = 128.52/x
3. Step 3: Cross multiply
   146.52x = 218.61 × 128.52
4. Step 4: Simplify right side
   146.52x = 28,095.76
5. Step 5: Solve for x
   x = 28,095.76/146.52
6. Step 6: Final answer
   x = 191.75