Finding the Fourth Proportional to 93.72, 139.74 and 89.94

Step by Step Solution

1. Step 1: Write the proportion equation
   93.72 : 139.74 = 89.94 : x
2. Step 2: Convert to fraction form
   93.72/139.74 = 89.94/x
3. Step 3: Cross multiply
   93.72x = 139.74 × 89.94
4. Step 4: Simplify right side
   93.72x = 12,568.22
5. Step 5: Solve for x
   x = 12,568.22/93.72
6. Step 6: Final answer
   x = 134.10