Finding the Fourth Proportional to 89.57, 123.60 and 56.84

Step by Step Solution

1. Step 1: Write the proportion equation
   89.57 : 123.60 = 56.84 : x
2. Step 2: Convert to fraction form
   89.57/123.60 = 56.84/x
3. Step 3: Cross multiply
   89.57x = 123.60 × 56.84
4. Step 4: Simplify right side
   89.57x = 7,025.42
5. Step 5: Solve for x
   x = 7,025.42/89.57
6. Step 6: Final answer
   x = 78.44