Finding the Fourth Proportional to 103.33, 142.18 and 78.63

Step by Step Solution

1. Step 1: Write the proportion equation
   103.33 : 142.18 = 78.63 : x
2. Step 2: Convert to fraction form
   103.33/142.18 = 78.63/x
3. Step 3: Cross multiply
   103.33x = 142.18 × 78.63
4. Step 4: Simplify right side
   103.33x = 11,179.61
5. Step 5: Solve for x
   x = 11,179.61/103.33
6. Step 6: Final answer
   x = 108.19