Finding the Fourth Proportional to 123.58, 185.03 and 72.09

Step by Step Solution

1. Step 1: Write the proportion equation
   123.58 : 185.03 = 72.09 : x
2. Step 2: Convert to fraction form
   123.58/185.03 = 72.09/x
3. Step 3: Cross multiply
   123.58x = 185.03 × 72.09
4. Step 4: Simplify right side
   123.58x = 13,339.13
5. Step 5: Solve for x
   x = 13,339.13/123.58
6. Step 6: Final answer
   x = 107.94