Finding the Fourth Proportional to 89.97, 124.17 and 56.78

Step by Step Solution

1. Step 1: Write the proportion equation
   89.97 : 124.17 = 56.78 : x
2. Step 2: Convert to fraction form
   89.97/124.17 = 56.78/x
3. Step 3: Cross multiply
   89.97x = 124.17 × 56.78
4. Step 4: Simplify right side
   89.97x = 7,050.37
5. Step 5: Solve for x
   x = 7,050.37/89.97
6. Step 6: Final answer
   x = 78.36