Finding the Fourth Proportional to 93.89, 139.88 and 89.30

Step by Step Solution

1. Step 1: Write the proportion equation
   93.89 : 139.88 = 89.30 : x
2. Step 2: Convert to fraction form
   93.89/139.88 = 89.30/x
3. Step 3: Cross multiply
   93.89x = 139.88 × 89.30
4. Step 4: Simplify right side
   93.89x = 12,490.14
5. Step 5: Solve for x
   x = 12,490.14/93.89
6. Step 6: Final answer
   x = 133.04