Finding the Fourth Proportional to 139.83, 209.61 and 58.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139.83 : 209.61 = 58.72 : x
2. Step 2: Convert to fraction form
   139.83/209.61 = 58.72/x
3. Step 3: Cross multiply
   139.83x = 209.61 × 58.72
4. Step 4: Simplify right side
   139.83x = 12,308.30
5. Step 5: Solve for x
   x = 12,308.30/139.83
6. Step 6: Final answer
   x = 88.02