Finding the Fourth Proportional to 77.30, 116.18 and 50.42

Step by Step Solution

1. Step 1: Write the proportion equation
   77.30 : 116.18 = 50.42 : x
2. Step 2: Convert to fraction form
   77.30/116.18 = 50.42/x
3. Step 3: Cross multiply
   77.30x = 116.18 × 50.42
4. Step 4: Simplify right side
   77.30x = 5,858.31
5. Step 5: Solve for x
   x = 5,858.31/77.30
6. Step 6: Final answer
   x = 75.78