Finding the Fourth Proportional to 123.31, 184.98 and 42.21

Step by Step Solution

1. Step 1: Write the proportion equation
   123.31 : 184.98 = 42.21 : x
2. Step 2: Convert to fraction form
   123.31/184.98 = 42.21/x
3. Step 3: Cross multiply
   123.31x = 184.98 × 42.21
4. Step 4: Simplify right side
   123.31x = 7,808.01
5. Step 5: Solve for x
   x = 7,808.01/123.31
6. Step 6: Final answer
   x = 63.32