Finding the Fourth Proportional to 99.81, 149.58 and 72.63

Step by Step Solution

1. Step 1: Write the proportion equation
   99.81 : 149.58 = 72.63 : x
2. Step 2: Convert to fraction form
   99.81/149.58 = 72.63/x
3. Step 3: Cross multiply
   99.81x = 149.58 × 72.63
4. Step 4: Simplify right side
   99.81x = 10,864.00
5. Step 5: Solve for x
   x = 10,864.00/99.81
6. Step 6: Final answer
   x = 108.85