Finding the Fourth Proportional to 139.96, 209.82 and 58.69

Step by Step Solution

1. Step 1: Write the proportion equation
   139.96 : 209.82 = 58.69 : x
2. Step 2: Convert to fraction form
   139.96/209.82 = 58.69/x
3. Step 3: Cross multiply
   139.96x = 209.82 × 58.69
4. Step 4: Simplify right side
   139.96x = 12,314.82
5. Step 5: Solve for x
   x = 12,314.82/139.96
6. Step 6: Final answer
   x = 87.99