Finding the Fourth Proportional to 89.88, 123.94 and 56.62

Step by Step Solution

1. Step 1: Write the proportion equation
   89.88 : 123.94 = 56.62 : x
2. Step 2: Convert to fraction form
   89.88/123.94 = 56.62/x
3. Step 3: Cross multiply
   89.88x = 123.94 × 56.62
4. Step 4: Simplify right side
   89.88x = 7,017.20
5. Step 5: Solve for x
   x = 7,017.20/89.88
6. Step 6: Final answer
   x = 78.07