Finding the Fourth Proportional to 111.98, 167.15 and 99.02

Step by Step Solution

1. Step 1: Write the proportion equation
   111.98 : 167.15 = 99.02 : x
2. Step 2: Convert to fraction form
   111.98/167.15 = 99.02/x
3. Step 3: Cross multiply
   111.98x = 167.15 × 99.02
4. Step 4: Simplify right side
   111.98x = 16,551.19
5. Step 5: Solve for x
   x = 16,551.19/111.98
6. Step 6: Final answer
   x = 147.80