Finding the Fourth Proportional to 139.94, 209.76 and 58.71

Step by Step Solution

1. Step 1: Write the proportion equation
   139.94 : 209.76 = 58.71 : x
2. Step 2: Convert to fraction form
   139.94/209.76 = 58.71/x
3. Step 3: Cross multiply
   139.94x = 209.76 × 58.71
4. Step 4: Simplify right side
   139.94x = 12,315.01
5. Step 5: Solve for x
   x = 12,315.01/139.94
6. Step 6: Final answer
   x = 88.00