Finding the Fourth Proportional to 91.88, 137.83 and 40.50

Step by Step Solution

1. Step 1: Write the proportion equation
   91.88 : 137.83 = 40.50 : x
2. Step 2: Convert to fraction form
   91.88/137.83 = 40.50/x
3. Step 3: Cross multiply
   91.88x = 137.83 × 40.50
4. Step 4: Simplify right side
   91.88x = 5,581.57
5. Step 5: Solve for x
   x = 5,581.57/91.88
6. Step 6: Final answer
   x = 60.75