Finding the Fourth Proportional to 139.02, 190.82 and 123.13

Step by Step Solution

1. Step 1: Write the proportion equation
   139.02 : 190.82 = 123.13 : x
2. Step 2: Convert to fraction form
   139.02/190.82 = 123.13/x
3. Step 3: Cross multiply
   139.02x = 190.82 × 123.13
4. Step 4: Simplify right side
   139.02x = 23,495.67
5. Step 5: Solve for x
   x = 23,495.67/139.02
6. Step 6: Final answer
   x = 169.01