Finding the Fourth Proportional to 72.60, 108.89 and 18.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72.60 : 108.89 = 18.50 : x
2. Step 2: Convert to fraction form
   72.60/108.89 = 18.50/x
3. Step 3: Cross multiply
   72.60x = 108.89 × 18.50
4. Step 4: Simplify right side
   72.60x = 2,014.00
5. Step 5: Solve for x
   x = 2,014.00/72.60
6. Step 6: Final answer
   x = 27.74