Finding the Fourth Proportional to 99.51, 137.24 and 72.96

Step by Step Solution

1. Step 1: Write the proportion equation
   99.51 : 137.24 = 72.96 : x
2. Step 2: Convert to fraction form
   99.51/137.24 = 72.96/x
3. Step 3: Cross multiply
   99.51x = 137.24 × 72.96
4. Step 4: Simplify right side
   99.51x = 10,012.42
5. Step 5: Solve for x
   x = 10,012.42/99.51
6. Step 6: Final answer
   x = 100.62