Finding the Fourth Proportional to 72.32, 99.72 and 48.99

Step by Step Solution

1. Step 1: Write the proportion equation
   72.32 : 99.72 = 48.99 : x
2. Step 2: Convert to fraction form
   72.32/99.72 = 48.99/x
3. Step 3: Cross multiply
   72.32x = 99.72 × 48.99
4. Step 4: Simplify right side
   72.32x = 4,885.28
5. Step 5: Solve for x
   x = 4,885.28/72.32
6. Step 6: Final answer
   x = 67.55