Finding the Fourth Proportional to 81.16, 111.98 and 53.50

Step by Step Solution

1. Step 1: Write the proportion equation
   81.16 : 111.98 = 53.50 : x
2. Step 2: Convert to fraction form
   81.16/111.98 = 53.50/x
3. Step 3: Cross multiply
   81.16x = 111.98 × 53.50
4. Step 4: Simplify right side
   81.16x = 5,990.93
5. Step 5: Solve for x
   x = 5,990.93/81.16
6. Step 6: Final answer
   x = 73.82