Finding the Fourth Proportional to 89.77, 123.92 and 67.99

Step by Step Solution

1. Step 1: Write the proportion equation
   89.77 : 123.92 = 67.99 : x
2. Step 2: Convert to fraction form
   89.77/123.92 = 67.99/x
3. Step 3: Cross multiply
   89.77x = 123.92 × 67.99
4. Step 4: Simplify right side
   89.77x = 8,425.32
5. Step 5: Solve for x
   x = 8,425.32/89.77
6. Step 6: Final answer
   x = 93.85