Finding the Fourth Proportional to 112.37, 168.24 and 78.05

Step by Step Solution

1. Step 1: Write the proportion equation
   112.37 : 168.24 = 78.05 : x
2. Step 2: Convert to fraction form
   112.37/168.24 = 78.05/x
3. Step 3: Cross multiply
   112.37x = 168.24 × 78.05
4. Step 4: Simplify right side
   112.37x = 13,130.29
5. Step 5: Solve for x
   x = 13,130.29/112.37
6. Step 6: Final answer
   x = 116.85