Finding the Fourth Proportional to 67.54, 100.83 and 57.81

Step by Step Solution

1. Step 1: Write the proportion equation
   67.54 : 100.83 = 57.81 : x
2. Step 2: Convert to fraction form
   67.54/100.83 = 57.81/x
3. Step 3: Cross multiply
   67.54x = 100.83 × 57.81
4. Step 4: Simplify right side
   67.54x = 5,828.19
5. Step 5: Solve for x
   x = 5,828.19/67.54
6. Step 6: Final answer
   x = 86.29