Finding the Fourth Proportional to 221.33, 332.00 and 99.59

Step by Step Solution

1. Step 1: Write the proportion equation
   221.33 : 332.00 = 99.59 : x
2. Step 2: Convert to fraction form
   221.33/332.00 = 99.59/x
3. Step 3: Cross multiply
   221.33x = 332.00 × 99.59
4. Step 4: Simplify right side
   221.33x = 33,061.72
5. Step 5: Solve for x
   x = 33,061.72/221.33
6. Step 6: Final answer
   x = 149.38