Finding the Fourth Proportional to 139.67, 209.59 and 58.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139.67 : 209.59 = 58.52 : x
2. Step 2: Convert to fraction form
   139.67/209.59 = 58.52/x
3. Step 3: Cross multiply
   139.67x = 209.59 × 58.52
4. Step 4: Simplify right side
   139.67x = 12,265.58
5. Step 5: Solve for x
   x = 12,265.58/139.67
6. Step 6: Final answer
   x = 87.82