Finding the Fourth Proportional to 89.72, 123.90 and 67.94

Step by Step Solution

1. Step 1: Write the proportion equation
   89.72 : 123.90 = 67.94 : x
2. Step 2: Convert to fraction form
   89.72/123.90 = 67.94/x
3. Step 3: Cross multiply
   89.72x = 123.90 × 67.94
4. Step 4: Simplify right side
   89.72x = 8,417.77
5. Step 5: Solve for x
   x = 8,417.77/89.72
6. Step 6: Final answer
   x = 93.82