Finding the Fourth Proportional to 104.57, 156.72 and 56.42

Step by Step Solution

1. Step 1: Write the proportion equation
   104.57 : 156.72 = 56.42 : x
2. Step 2: Convert to fraction form
   104.57/156.72 = 56.42/x
3. Step 3: Cross multiply
   104.57x = 156.72 × 56.42
4. Step 4: Simplify right side
   104.57x = 8,842.14
5. Step 5: Solve for x
   x = 8,842.14/104.57
6. Step 6: Final answer
   x = 84.56