Finding the Fourth Proportional to 91.89, 137.84 and 37.79

Step by Step Solution

1. Step 1: Write the proportion equation
   91.89 : 137.84 = 37.79 : x
2. Step 2: Convert to fraction form
   91.89/137.84 = 37.79/x
3. Step 3: Cross multiply
   91.89x = 137.84 × 37.79
4. Step 4: Simplify right side
   91.89x = 5,208.10
5. Step 5: Solve for x
   x = 5,208.10/91.89
6. Step 6: Final answer
   x = 56.68