Finding the Fourth Proportional to 139.89, 209.71 and 62.79

Step by Step Solution

1. Step 1: Write the proportion equation
   139.89 : 209.71 = 62.79 : x
2. Step 2: Convert to fraction form
   139.89/209.71 = 62.79/x
3. Step 3: Cross multiply
   139.89x = 209.71 × 62.79
4. Step 4: Simplify right side
   139.89x = 13,167.69
5. Step 5: Solve for x
   x = 13,167.69/139.89
6. Step 6: Final answer
   x = 94.13