Finding the Fourth Proportional to 139.59, 209.59 and 116.91

Step by Step Solution

1. Step 1: Write the proportion equation
   139.59 : 209.59 = 116.91 : x
2. Step 2: Convert to fraction form
   139.59/209.59 = 116.91/x
3. Step 3: Cross multiply
   139.59x = 209.59 × 116.91
4. Step 4: Simplify right side
   139.59x = 24,502.87
5. Step 5: Solve for x
   x = 24,502.87/139.59
6. Step 6: Final answer
   x = 175.53