Finding the Fourth Proportional to 139.00, 191.83 and 86.53

Step by Step Solution

1. Step 1: Write the proportion equation
   139.00 : 191.83 = 86.53 : x
2. Step 2: Convert to fraction form
   139.00/191.83 = 86.53/x
3. Step 3: Cross multiply
   139.00x = 191.83 × 86.53
4. Step 4: Simplify right side
   139.00x = 16,598.09
5. Step 5: Solve for x
   x = 16,598.09/139.00
6. Step 6: Final answer
   x = 119.42