Finding the Fourth Proportional to 131.83, 181.96 and 105.78

Step by Step Solution

1. Step 1: Write the proportion equation
   131.83 : 181.96 = 105.78 : x
2. Step 2: Convert to fraction form
   131.83/181.96 = 105.78/x
3. Step 3: Cross multiply
   131.83x = 181.96 × 105.78
4. Step 4: Simplify right side
   131.83x = 19,247.46
5. Step 5: Solve for x
   x = 19,247.46/131.83
6. Step 6: Final answer
   x = 146.00