Finding the Fourth Proportional to 123.74, 185.71 and 55.31

Step by Step Solution

1. Step 1: Write the proportion equation
   123.74 : 185.71 = 55.31 : x
2. Step 2: Convert to fraction form
   123.74/185.71 = 55.31/x
3. Step 3: Cross multiply
   123.74x = 185.71 × 55.31
4. Step 4: Simplify right side
   123.74x = 10,271.62
5. Step 5: Solve for x
   x = 10,271.62/123.74
6. Step 6: Final answer
   x = 83.01