Finding the Fourth Proportional to 103.00, 142.01 and 86.59

Step by Step Solution

1. Step 1: Write the proportion equation
   103.00 : 142.01 = 86.59 : x
2. Step 2: Convert to fraction form
   103.00/142.01 = 86.59/x
3. Step 3: Cross multiply
   103.00x = 142.01 × 86.59
4. Step 4: Simplify right side
   103.00x = 12,295.50
5. Step 5: Solve for x
   x = 12,295.50/103.00
6. Step 6: Final answer
   x = 119.38