Finding the Fourth Proportional to 139.76, 209.58 and 62.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139.76 : 209.58 = 62.72 : x
2. Step 2: Convert to fraction form
   139.76/209.58 = 62.72/x
3. Step 3: Cross multiply
   139.76x = 209.58 × 62.72
4. Step 4: Simplify right side
   139.76x = 13,143.81
5. Step 5: Solve for x
   x = 13,143.81/139.76
6. Step 6: Final answer
   x = 94.05