Finding the Fourth Proportional to 128.25, 191.50 and 124.56

Step by Step Solution

1. Step 1: Write the proportion equation
   128.25 : 191.50 = 124.56 : x
2. Step 2: Convert to fraction form
   128.25/191.50 = 124.56/x
3. Step 3: Cross multiply
   128.25x = 191.50 × 124.56
4. Step 4: Simplify right side
   128.25x = 23,852.93
5. Step 5: Solve for x
   x = 23,852.93/128.25
6. Step 6: Final answer
   x = 185.99