Finding the Fourth Proportional to 123.02, 169.61 and 79.31

Step by Step Solution

1. Step 1: Write the proportion equation
   123.02 : 169.61 = 79.31 : x
2. Step 2: Convert to fraction form
   123.02/169.61 = 79.31/x
3. Step 3: Cross multiply
   123.02x = 169.61 × 79.31
4. Step 4: Simplify right side
   123.02x = 13,451.77
5. Step 5: Solve for x
   x = 13,451.77/123.02
6. Step 6: Final answer
   x = 109.35