Finding the Fourth Proportional to 128.38, 191.57 and 123.93

Step by Step Solution

1. Step 1: Write the proportion equation
   128.38 : 191.57 = 123.93 : x
2. Step 2: Convert to fraction form
   128.38/191.57 = 123.93/x
3. Step 3: Cross multiply
   128.38x = 191.57 × 123.93
4. Step 4: Simplify right side
   128.38x = 23,741.27
5. Step 5: Solve for x
   x = 23,741.27/128.38
6. Step 6: Final answer
   x = 184.93