Finding the Fourth Proportional to 99.50, 137.03 and 88.56

Step by Step Solution

1. Step 1: Write the proportion equation
   99.50 : 137.03 = 88.56 : x
2. Step 2: Convert to fraction form
   99.50/137.03 = 88.56/x
3. Step 3: Cross multiply
   99.50x = 137.03 × 88.56
4. Step 4: Simplify right side
   99.50x = 12,134.93
5. Step 5: Solve for x
   x = 12,134.93/99.50
6. Step 6: Final answer
   x = 121.97