Finding the Fourth Proportional to 112.59, 168.18 and 78.06

Step by Step Solution

1. Step 1: Write the proportion equation
   112.59 : 168.18 = 78.06 : x
2. Step 2: Convert to fraction form
   112.59/168.18 = 78.06/x
3. Step 3: Cross multiply
   112.59x = 168.18 × 78.06
4. Step 4: Simplify right side
   112.59x = 13,128.13
5. Step 5: Solve for x
   x = 13,128.13/112.59
6. Step 6: Final answer
   x = 116.60