Finding the Fourth Proportional to 99.84, 149.63 and 72.47

Step by Step Solution

1. Step 1: Write the proportion equation
   99.84 : 149.63 = 72.47 : x
2. Step 2: Convert to fraction form
   99.84/149.63 = 72.47/x
3. Step 3: Cross multiply
   99.84x = 149.63 × 72.47
4. Step 4: Simplify right side
   99.84x = 10,842.58
5. Step 5: Solve for x
   x = 10,842.58/99.84
6. Step 6: Final answer
   x = 108.60