Finding the Fourth Proportional to 91.83, 137.50 and 61.36

Step by Step Solution

1. Step 1: Write the proportion equation
   91.83 : 137.50 = 61.36 : x
2. Step 2: Convert to fraction form
   91.83/137.50 = 61.36/x
3. Step 3: Cross multiply
   91.83x = 137.50 × 61.36
4. Step 4: Simplify right side
   91.83x = 8,436.50
5. Step 5: Solve for x
   x = 8,436.50/91.83
6. Step 6: Final answer
   x = 91.87