Finding the Fourth Proportional to 123.31, 185.10 and 51.22

Step by Step Solution

1. Step 1: Write the proportion equation
   123.31 : 185.10 = 51.22 : x
2. Step 2: Convert to fraction form
   123.31/185.10 = 51.22/x
3. Step 3: Cross multiply
   123.31x = 185.10 × 51.22
4. Step 4: Simplify right side
   123.31x = 9,480.82
5. Step 5: Solve for x
   x = 9,480.82/123.31
6. Step 6: Final answer
   x = 76.89