Finding the Fourth Proportional to 123.31, 184.94 and 42.13

Step by Step Solution

1. Step 1: Write the proportion equation
   123.31 : 184.94 = 42.13 : x
2. Step 2: Convert to fraction form
   123.31/184.94 = 42.13/x
3. Step 3: Cross multiply
   123.31x = 184.94 × 42.13
4. Step 4: Simplify right side
   123.31x = 7,791.52
5. Step 5: Solve for x
   x = 7,791.52/123.31
6. Step 6: Final answer
   x = 63.19