Finding the Fourth Proportional to 112.47, 168.59 and 78.25

Step by Step Solution

1. Step 1: Write the proportion equation
   112.47 : 168.59 = 78.25 : x
2. Step 2: Convert to fraction form
   112.47/168.59 = 78.25/x
3. Step 3: Cross multiply
   112.47x = 168.59 × 78.25
4. Step 4: Simplify right side
   112.47x = 13,191.94
5. Step 5: Solve for x
   x = 13,191.94/112.47
6. Step 6: Final answer
   x = 117.29