Finding the Fourth Proportional to 101.89, 152.72 and 81.62

Step by Step Solution

1. Step 1: Write the proportion equation
   101.89 : 152.72 = 81.62 : x
2. Step 2: Convert to fraction form
   101.89/152.72 = 81.62/x
3. Step 3: Cross multiply
   101.89x = 152.72 × 81.62
4. Step 4: Simplify right side
   101.89x = 12,465.01
5. Step 5: Solve for x
   x = 12,465.01/101.89
6. Step 6: Final answer
   x = 122.34