Finding the Fourth Proportional to 111.87, 167.82 and 91.76

Step by Step Solution

1. Step 1: Write the proportion equation
   111.87 : 167.82 = 91.76 : x
2. Step 2: Convert to fraction form
   111.87/167.82 = 91.76/x
3. Step 3: Cross multiply
   111.87x = 167.82 × 91.76
4. Step 4: Simplify right side
   111.87x = 15,398.32
5. Step 5: Solve for x
   x = 15,398.32/111.87
6. Step 6: Final answer
   x = 137.64