Finding the Fourth Proportional to 139.69, 209.61 and 58.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139.69 : 209.61 = 58.52 : x
2. Step 2: Convert to fraction form
   139.69/209.61 = 58.52/x
3. Step 3: Cross multiply
   139.69x = 209.61 × 58.52
4. Step 4: Simplify right side
   139.69x = 12,266.90
5. Step 5: Solve for x
   x = 12,266.90/139.69
6. Step 6: Final answer
   x = 87.82