Finding the Fourth Proportional to 210.72, 290.72 and 123.32

Step by Step Solution

1. Step 1: Write the proportion equation
   210.72 : 290.72 = 123.32 : x
2. Step 2: Convert to fraction form
   210.72/290.72 = 123.32/x
3. Step 3: Cross multiply
   210.72x = 290.72 × 123.32
4. Step 4: Simplify right side
   210.72x = 35,851.59
5. Step 5: Solve for x
   x = 35,851.59/210.72
6. Step 6: Final answer
   x = 170.14