Finding the Fourth Proportional to 139.89, 208.59 and 124.29

Step by Step Solution

1. Step 1: Write the proportion equation
   139.89 : 208.59 = 124.29 : x
2. Step 2: Convert to fraction form
   139.89/208.59 = 124.29/x
3. Step 3: Cross multiply
   139.89x = 208.59 × 124.29
4. Step 4: Simplify right side
   139.89x = 25,925.65
5. Step 5: Solve for x
   x = 25,925.65/139.89
6. Step 6: Final answer
   x = 185.33