Finding the Fourth Proportional to 91.89, 137.82 and 53.34

Step by Step Solution

1. Step 1: Write the proportion equation
   91.89 : 137.82 = 53.34 : x
2. Step 2: Convert to fraction form
   91.89/137.82 = 53.34/x
3. Step 3: Cross multiply
   91.89x = 137.82 × 53.34
4. Step 4: Simplify right side
   91.89x = 7,351.32
5. Step 5: Solve for x
   x = 7,351.32/91.89
6. Step 6: Final answer
   x = 80.00