Finding the Fourth Proportional to 83.12, 114.72 and 50.40

Step by Step Solution

1. Step 1: Write the proportion equation
   83.12 : 114.72 = 50.40 : x
2. Step 2: Convert to fraction form
   83.12/114.72 = 50.40/x
3. Step 3: Cross multiply
   83.12x = 114.72 × 50.40
4. Step 4: Simplify right side
   83.12x = 5,781.89
5. Step 5: Solve for x
   x = 5,781.89/83.12
6. Step 6: Final answer
   x = 69.56