Finding the Fourth Proportional to 123.91, 185.72 and 55.29

Step by Step Solution

1. Step 1: Write the proportion equation
   123.91 : 185.72 = 55.29 : x
2. Step 2: Convert to fraction form
   123.91/185.72 = 55.29/x
3. Step 3: Cross multiply
   123.91x = 185.72 × 55.29
4. Step 4: Simplify right side
   123.91x = 10,267.25
5. Step 5: Solve for x
   x = 10,267.25/123.91
6. Step 6: Final answer
   x = 82.86