Finding the Fourth Proportional to 139.59, 209.34 and 58.41

Step by Step Solution

1. Step 1: Write the proportion equation
   139.59 : 209.34 = 58.41 : x
2. Step 2: Convert to fraction form
   139.59/209.34 = 58.41/x
3. Step 3: Cross multiply
   139.59x = 209.34 × 58.41
4. Step 4: Simplify right side
   139.59x = 12,227.55
5. Step 5: Solve for x
   x = 12,227.55/139.59
6. Step 6: Final answer
   x = 87.60