Finding the Fourth Proportional to 103.41, 142.56 and 86.00

Step by Step Solution

1. Step 1: Write the proportion equation
   103.41 : 142.56 = 86.00 : x
2. Step 2: Convert to fraction form
   103.41/142.56 = 86.00/x
3. Step 3: Cross multiply
   103.41x = 142.56 × 86.00
4. Step 4: Simplify right side
   103.41x = 12,259.45
5. Step 5: Solve for x
   x = 12,259.45/103.41
6. Step 6: Final answer
   x = 118.55