Finding the Fourth Proportional to 113.49, 156.59 and 78.55

Step by Step Solution

1. Step 1: Write the proportion equation
   113.49 : 156.59 = 78.55 : x
2. Step 2: Convert to fraction form
   113.49/156.59 = 78.55/x
3. Step 3: Cross multiply
   113.49x = 156.59 × 78.55
4. Step 4: Simplify right side
   113.49x = 12,300.14
5. Step 5: Solve for x
   x = 12,300.14/113.49
6. Step 6: Final answer
   x = 108.38