Finding the Fourth Proportional to 113.52, 156.72 and 78.56

Step by Step Solution

1. Step 1: Write the proportion equation
   113.52 : 156.72 = 78.56 : x
2. Step 2: Convert to fraction form
   113.52/156.72 = 78.56/x
3. Step 3: Cross multiply
   113.52x = 156.72 × 78.56
4. Step 4: Simplify right side
   113.52x = 12,311.14
5. Step 5: Solve for x
   x = 12,311.14/113.52
6. Step 6: Final answer
   x = 108.45