Finding the Fourth Proportional to 112.69, 168.89 and 99.63

Step by Step Solution

1. Step 1: Write the proportion equation
   112.69 : 168.89 = 99.63 : x
2. Step 2: Convert to fraction form
   112.69/168.89 = 99.63/x
3. Step 3: Cross multiply
   112.69x = 168.89 × 99.63
4. Step 4: Simplify right side
   112.69x = 16,826.01
5. Step 5: Solve for x
   x = 16,826.01/112.69
6. Step 6: Final answer
   x = 149.31