Finding the Fourth Proportional to 83.51, 115.18 and 50.72

Step by Step Solution

1. Step 1: Write the proportion equation
   83.51 : 115.18 = 50.72 : x
2. Step 2: Convert to fraction form
   83.51/115.18 = 50.72/x
3. Step 3: Cross multiply
   83.51x = 115.18 × 50.72
4. Step 4: Simplify right side
   83.51x = 5,842.09
5. Step 5: Solve for x
   x = 5,842.09/83.51
6. Step 6: Final answer
   x = 69.96