Finding the Fourth Proportional to 123.31, 185.00 and 42.17

Step by Step Solution

1. Step 1: Write the proportion equation
   123.31 : 185.00 = 42.17 : x
2. Step 2: Convert to fraction form
   123.31/185.00 = 42.17/x
3. Step 3: Cross multiply
   123.31x = 185.00 × 42.17
4. Step 4: Simplify right side
   123.31x = 7,800.31
5. Step 5: Solve for x
   x = 7,800.31/123.31
6. Step 6: Final answer
   x = 63.26