Finding the Fourth Proportional to 164.00, 245.81 and 139.55

Step by Step Solution

1. Step 1: Write the proportion equation
   164.00 : 245.81 = 139.55 : x
2. Step 2: Convert to fraction form
   164.00/245.81 = 139.55/x
3. Step 3: Cross multiply
   164.00x = 245.81 × 139.55
4. Step 4: Simplify right side
   164.00x = 34,300.86
5. Step 5: Solve for x
   x = 34,300.86/164.00
6. Step 6: Final answer
   x = 209.16