Finding the Fourth Proportional to 112.78, 168.22 and 100.63

Step by Step Solution

1. Step 1: Write the proportion equation
   112.78 : 168.22 = 100.63 : x
2. Step 2: Convert to fraction form
   112.78/168.22 = 100.63/x
3. Step 3: Cross multiply
   112.78x = 168.22 × 100.63
4. Step 4: Simplify right side
   112.78x = 16,927.98
5. Step 5: Solve for x
   x = 16,927.98/112.78
6. Step 6: Final answer
   x = 150.10